How can I stop Windows from providing warnings about my processor?

Windows is notifying me every 20 minutes that my processor (i7 7700k) isn't supported by Windows 7, yet according to Intel it is. This wouldn't have been an issue if the message appeared once a month, or even once a week, but the problem is that the message is appearing every 20 minutes or so. This is especially annoying when I work in Photoshop and my selection gets cleared right when the window switches to the warning.     Originally I tried uninstalling the update causing the issue (KB4012218), which didn't work as it installed itself again, and so I fixed it by only selecting to install important security updates, which worked for about a week or two, but then yesterday one "security update called "April 2017 Security Quality Update for Windows (KB4015546)" showed up in Windows Update again and unlike ALL the other security updates, the checkmark was checked and grayed out, so I couldn't uncheck it, and the "hide update" was grayed out as well. I installed it in an attempt to uninstall it, and after I restarted the computer, it said said "Configuring Windows Updates" and then into a really weird screen - it was the normal Windows 7 boot animation, but instead of "Starting Windows" it said "Applying registry operation 3/40 (HKEY/current)" and then "Applying update operation 2/5 (C/Windows/Syste...)", and at first I thought I may have accidentally made it upgrade to Windows 10, but luckily not. The computer boot up and the annoying pop-up appeared. After that was done I thought the problem could've been fixed by uninstalling the update that caused the problem, but even though the update was uninstalled, the issue still remained.  I don't understand why this is considered to be a security update, as this update blocks any and all installation of Windows Update, including important security updates. Was there recently a virus discovered that made the i7700k vulnerable to remote executions?  I reinstalled Windows 7 and after hours of investigation, I found out that another update was causing the check mark grey out of the "security update" was another update, one of the updates that gets installed with all the other thousands of updates.  The strange thing is is that Intel actually fully supports the Intel i7 7700k on Windows 7. Both the chipset and graphics driver is available for it, and does offer much better performance then the previous processor I had installed according to SiSoft.   I understand that Microsoft wants people to be using an OS built for the specific processor, and I appreciate that Microsoft is notifying me, but I would like a way to unsubscribe for these warnings and take the risks, as according to Intel, the i7-700k processor fully supports Windows 7. I called and confirmed with Intel and they confirmed that I should have no problem running Windows 7 on it. I think Microsoft made a mistake by confusing the arm-based Intel Stratix 10 with Intel i7 7700k, as ARM architecture would be the one incompatible with Windows 10. I called Microsoft and let them know about this, but they said that the i7-7700k is indeed incompatible and that Intel is saying the wrong information because their support is not knowledgeable about chipset design. I'm not sure whose right, but I do know that the processor box itself supports Windows 7, 8, 8.1, or 10. There must be confusion between the designers of the box or Microsoft employees.  Frankly, I don't want to upgrade to Windows 10 because all the times I upgraded I experienced at least 3 different bugs and annoyances, not to mention that I don't like this "Store" or "MSN" or the new "Start" screen, especially with its significantly lacking search functionality.  I kindly appreciate anyones help.


I live in Tunisia, exactly in Gafsa .. and there's a weird effect is happening, i really tried to ask people but no one had a clue, also i have seen that in other places on the internet. If you put a car on a road, it ll twist towards the low place, which is obviously against gravity laws .. i don't know if there's a magnetic field which affects the car, but i should of tried another metal to be sure .. well anyways, it really interested me for years and i'm looking for an answer . The video of someone recording this in my city :


Colors sensitivity by human eye and light wavelength

I do not understand why human eye sees different colours from the LED TV/screen. Especially violet.  For example, how we get yellow color on TV. There are 3 small diodes Red, Green Blue in LED screen and when we see yellow, that means Red and green diodes are on and blue is off. This I understand, because wavelength for red approximately 600 nm, for green 500 nm and yellow in the middle, let say 550 nm. In this case 600 for red + 500 for green gives 550 in average, that is yellow. it is ok, good explanation.  But what about violet? Violet wavelength is 300 nm, We get it on TV if we combine red and blue. red is 600 nm, blue is 400 nm and in average I expect that we will see it as 500 nm green. But why we see it as violet which should be 300 nm? Anyway, we cannot get at all 300 nm if we combine red (600), green (500) and blue (400).  All wavelengths here are very approximate from the top of my head maybe +/- 50 nm or even more. Exact numbers do not matter, the main point is the idea how human eye see different colors.


I've always passed by reference by dereferencing in the function prototype and then referencing the variable when passing in the parameter. I've recently seen what seems to be a way to pass by reference as well but it works slightly different. It references the parameter in the prototype but does not expect any sort of (de)reference when inputting the value into the function. When using my method, you must use the "->" operator to access member functions, but when using the other method you can use the "." operator. Can you please explain the difference between these two methods and if there is a more commonly used method in practice. I have some example code below to better explain what I mean:  #include <iostream> #include <string> using namespace std;  void something(string *byRef, string &dontKnow);  int main(int argc, const char * argv[]) {     string test1 = "test string 1";     string test2 = "second test";      something(&test1, test2);      return 0; }  void something(string *byRef, string &dontKnow) {     cout << "test1 address = " << byRef << "\nsize = " << byRef->size() << endl;//size function accessed by "->"     cout << "test2 address = " << &dontKnow << "\nsize = " << dontKnow.size() << endl;//now accessed by "." and reference operator required for address }


How do I express 0.999(9) as a fraction?

I'm noob in math. If 0.333(3) is 1/3, 0.666(6) is 2/3, then 0.999(9) is what?  If 3/3 and 0.999(9) is the same, then how can I express one of them without expressing the other?


Neutrino flavor models from irreducible representations of discrete groups

I am starting ph.D in neutrino physics-ph. I've read some papers on discrete symmetries and neutrino mass models. Neutrino flavor models are built using irreducible representations of discrete groups, or even SM is based on irreducible representation of certain groups only. Why is it possible only in irreps? Why can't we use any other representations (reducible, adjoint reps or any other if there is any)?


Application to a real life problem: identifying outliers in univariate time series data

I have a rather simple problem that I'm having trouble deciding an answer upon. As a student studying Statistics I'm very familiar with terminology and theory but I suppose I'm stumped on my first real application of classroom teachings.  I have data on the size of database uploads that occur everyday. The database is ever increasing with no upper bound. Right now I'm working with about 2 months of information and we'll assume I want to keep collecting records indefinitely. eg:   03/06/13 - 239238  04/06/13 - 240594  05/06/13 - 256920  etc...  I want to generate an alert if either  1) the current day's file size is smaller than the previous day's file size 2) the current day's file size is unusually larger than expected compared to the previous day's file size  I want to stress that I merely only want an alert, or to know of when either case occurs, not to delete the record of this instance or do anything to it, as many of the searches I've tried to find of an existing question similar to mine has to do with how to handle the outlier itself.  So the problem for me is, what measure should be used to more rigorously determine if today's file size is an outlier as opposed to some arbitrary rule? I ideally want to use the given historical data rather than just saying 'if today's size is 10% bigger than yesterdays, alert me'.  Is the boxplot good enough? Is calculating and using the mean and standard deviation 'better' (browsing around would leave me to believe that the latter is outdated and the former is better)? It is entirely possible that the database would need to be cleaned leading to a large drop, or that the database would have a huge import leading to a large increase, both of which are acceptable but would throw off the mean and standard deviation.   Any help is appreciated. Thank you.


Consider a function $f(x,y):[0,1] \times [0,1] \rightarrow R.$ What is the difference between $f$ continuous in each argument and jointly continuous?


Any app on Ubuntu to open and/or convert HEIF pictures (.HEIC, High Efficiency Image File Format)?

A certain cellphone maker has changed the default format of taking pictures to HEIF (.HEIC, High Efficiency Image File Format), without asking the users (although there is still the option to use jpeg/jpg).   Is there an app/program on Ubuntu that can open and/or convert HEIF-pictures and even let them be edited?


On your main profile/dashboard, there is a "helpful flag" stat with a number (in my case, 86):    If you click on the number, you are taken to your flagging history with more stats which say that my number of flags "deemed helpful" is really 79, not 86 as the main profile suggests.    Not to mention that the use of the term "moderator attention flags" is confusing.. There is a separate option for "moderator attention" when flagging, but "moderator attention flags" in the history seemingly refers to total number of flags..  Can these terms and numbers be clarified and made more consistent?


Let $k$ be a field. Then $k[x]/(x^2)$ has only one prime ideal.  It is clear that $(X)$ is the maximal ideal thus prime where $X$ is the class elements $x$. How do I know there aren't other prime ideals? I tried to define homomorphism $\phi':k[x]/(x^2)\to k$ by evaluation but it seems there is no other way to define the map well defined other than evaluating at 0 due to $\phi'([f])=\phi'([g])$ not equal for different representatives.


Word/phrase for something that perpetuates/sustains/exacerbates something else?

Looking for a word/phrase with negative or neutral connotations to describe policies that perpetuate/sustain/protract/exacerbate the problem they are attempting to resolve. Not necessarily the original cause of the problem, but doesn't need to exclude this option.   I can only find nouns with positive connotations (stabiliser, ballast, etc) which would not be appropriate.


Problem regarding uniform convergence of holomorphic function

This is from Stein and Shakarchi  This exercise shows how the mean square convergence dominates the uniform convergence of analytic functions. If $U$ is an open subset of $\mathbb{C}$ we use the notation $$||f||_{L^2(U)}=(\int_U{|f(z)|^2dxdy})^{1/2}$$ for the mean square norm, and $$||f||_{L^\infty(U)}=sup{|f(z)|}$$ for the sup norm. (a) If $f$ is holomorphic in a neighborhood of the disc $D_r (z_0)$, show that for any $0<s<r$ there exists a constants $C>0$ (which depends on $s$ and $r$) such that $$||f||_{L^\infty(D_s(z_0))}\leq C||f||_{L^2(D_r(z_0))}$$ (b) Prove that if ${f_n}$ is a Cauchy sequence of holomorphic functions in the mean square norm $||\cdot||_{L^2(U)}$, then the sequence ${f_n}$ converges uniformly on every compact subset of $U$ to a holomorphic function. [Hint: Use the mean-value property]  I have managed to solve part (a). I'm really lost for (b). Can you give me any tips? This seems like a generalization of real analysis but I don't really understand how to approach this.


SetActive true/false only once when game install first time unity?

In my unity game I try to give player instruction how to play but it only in first level and first time when game install so how i can do this?


Do the following negations mean the same thing?

I don't think you understood me. / I think you misunderstood me.    Do these senteces mean the same thing? If not, what's the difference?  Edit: I just realized that I asked something different from what I originally wanted. So I am also interested in the following comparison:     I don't think you understand me. / I think you don't understand me.


trim the terminal command prompt working directory

When using the terminal in a deep folder structure sometimes the prompt can take up most of the line.  Is there any way in which I can trim the working directory?  I know I can do  PS1="\W >"   to only print the current directory and not the full path, but is there a way to have something like:  /home/smauel/de...ther/folder >


Any program or trick to find the definition of a variable?

Many times when I am watching others code I just want to find where and how a variable is defined. Normally what I do now is look for the type of the variable until I find the definition, that is very time consuming. And I guess that there are some tools that can help me in this rutinary situation. Any suggestion in some tools or commands to help me in this task?.  I know that using a GUI and creating a project this is done automatically I am talking of a way to do this without a GUI. I am working with only text mode. I am running under Linux and I am using C/C++, but suggestions for other languages are welcome.  Thanks a lot.  A possible solution  Michel in one of his comments propose a simple an effective solution define again the variable, in that case in compilation time, the compiler will inform where is the previous definiton. Of course to apply this solution we need to think previously in the locality of the variable.


Show or don't show the currently selected option in menu or dropdown

Let's say you have a dropdown where a user can choose a color. I'm currently comtemplating whether or not to use the following scheme. When a user selects a color, that color disappaers in the sorted list of colors, but of course it is still visible at top (B) This is different from how dropdown menu's usually work (A):    The advantage could be that users cannot reselect something that is already selected. In the color dropdown example this advantage is very small, but consider these cases:   A dropdown with only 6 options. Reducing this dropdown by 1 item makes it faster to mentally process all the options, considering the selected item is already processed in the user's mind and he doesn't have to reprocess/look at it again. It saves space on the screen (again, the example with the color dropdown might not be relevant for this point). A navigation bar where selecting an item would cause the page to reload (or go to another page). You do not want the user to be able to select the page they're currently viewing again, because that would cause an annoying and unnecessary reload. A possible disadvantage could be that the list would change everytime, which actually increases mental load. For example: consider the options:      A B C D E.    When A is selected, then "B" would be the first visible option to select, C the second and so on:     A      B C D E   When a user now selects D, the order of the unselected items change:     D      A B C E   Suddenly, users who thought "the first item is always B", might misclick because now A is first and B is second in the list op options.  Any additional thought on this?


Open subsets in a manifold as submanifold of the same dimension?

An open set in an $n$-manifold is clearly a submanifold of the same dimension as its containing manifold (see open manifolds).   Now, given an $n$-manifold $M$, is it true that a set, to be the underlying set of a submanifold of $M$ with dimension $n$, must be open?


Can I download free apps without a payment method?

I just downloaded the newest iOS version, which I don't know what it is, and I can't download free apps now. I used to be able to download free apps, but now apple requires a credit card to download apps even if the apps are free.  I don't know what version of iOS I am using, nor what type I was using earlier. Nor do I know what type of iPhone I am using other than that it is an iPhone of some sort. I don't know how to find out this information either.


As I have come to understand, SSH always goes through the process of reverse DNS lookups whether you are connecting to user@example.com or a local server calleduser@192.168.0.56. I do not know, however, why the SSH command performs a reverse dns lookup for IP addresses regardless. Like, I had to change my DNS server configuration on my Pi to Google's open DNS so that my client machine wouldn't take so long to actually handshake with the server through DNS lookup with my ISPs DNS servers. Even when my Pi is on my local network.  tl;dr - Why does SSH do reverse DNS lookup for local IP addresses?


Why there is no tag cloud to choose tags from?

I feel like hunt and peck on the Stack Exchange network when choosing the tags for a question. How one should know which tags exist when there is no list or cloud of tags to choose from?


When does a square matrix have an eigen-decomposition? When is a matrix defective?

Some square matrices, like $ \left( \begin{array}{cc} 0 & 1 \\ 0 & 0 \end{array} \right)$, don't have a complete set of eigenvectors. By complete I mean that the eigenvectors span the entire space. The only eigenvector of the previous matrix is $\left( \begin{array}{c} 1 \\ 0 \end{array} \right)$. These are called defective matrices. How can one prove whether a matrix is or is not defective?   The reason that I ask is that I know stochastic matrices are supposed to have an eigen-decomposition but I don't know how to show it?


I have a computer with Arch linux. I want to know which desktop environment is installed.   My ultimate goal would be to install Gnome. Is it possible to have two desktop environments.


“How to fix datatype in pandas-dataframe which gives an Value error ?”ValueError: could not convert string to float: '-- '

I am working with a Youtube dataset. But when I try to convert the datatype of a column I get a Value Error. How do I fix it? ValueError: could not convert string to float: '-- '


When Michio Kaku talks about science he often likes to refer to string theory and  to his equation which looks like this (not sure if wrote right): $$L = \Phi^\dagger[i\partial_{\tau}-H]\Phi + \Phi^{\dagger} \ast \Phi \ast\Phi .$$ It appears to me like some field theory Lagrangian with an interacting and a free part but I have no idea what it actually describes.   Can all of string theory really be summarised in this equation? Can someone give a brief description?


Idioms for saying when one's bad situation compounded with more problems

Any idioms in English for describing a person's, who is already in a bad situation confronted with new difficulties?   In my native language, we say "A man already stuck by lightning, bitten by a snake'  I am aware of 'From frying pan to fire', but that is when situation is going from bad to worse. Here he is facing additional difficulties.  thanks


Can I use "years" as a continuous variable ("years" as calendar years from 1984 to 2014) to see if NDVI (normalized difference vegetation index), of the same area at the same time (summer), has changed positively or negatively over the years, for example with a GLMM or GLM?


If given an atom say ${^{108}_{47}Ag}$, what is the systematic way to determine its spin so that one knows whether it is a boson or a fermion?


Beginner: how to start with contributing for ubuntu

Can I take part in some project for ubuntu? What should i do? I am new, and i would love to complete or take part or start a project for it.  Thx


Python: generate a list containing lists from several lists

I have the following lists:  [1,2,3] [1] [1,2,3,4]   From the above, I would like to generate a list containing:  [[1,1,1],[1,1,2],[1,1,3],[1,1,4], [2,1,1], [2,1,2], [2,1,3], [2,1,4], [3,1,2], [3,1,3],[3,1,4]]   What is this process called?   Generate a factorial of python lists?   Is there a built-in library that does this?


I need to print an image at a certain size. What dimensions and resolution should I use?

(This question is meant to be a resource to direct others to given that this is a common question.)  Given the task of creating an image that will be printed at a certain size, what pixel dimensions and resolution should I be setting my file at?


How can I factory reset my Kubuntu and return it to new-like state, without reinstalling it? (I am having problems reinstalling the OS.)


Is there a Hausdorff space $X$ separating points of any Hausdorff space?

There is a nice property of normal spaces, namely, closed disjoint subsets can be separated by continuous functions into $\mathbb R$.   Then you ask yourself, what about Hausdorff spaces?, are all Hausdorff spaces completely Hausdorff?   Well, if we choose our separating space $X$, that is, the space such that for any Hausdorff $Y$ and any distinct $a,b\in Y$ there is some continuous $f:Y\rightarrow X$ with $f(a)\neq f(b)$, to be completely regular and Hausdorff, this cannot happen by an example of E. Hewitt, Hewitt’s Condensed Corkscrew, call it $\mathbb H$; as any continuous function from $\mathbb H$ into $\mathbb R$ is constant, and any Hausdorff completely regular space $X$ can be embedded into a product of closed intervals $\prod_{i\in I}[0,1]$, and thus any continuous $f:\mathbb H\rightarrow X\subseteq \prod_{i\in I}[0,1]$ is constant, as each $\pi_i\circ f$ is constant, so our candidate to be the separating space $X$ cannot even be $[0,1]$.  My question is, does there exist a Hausdorff space $X$ such that for all Hausdorff spaces $Y$, and any distinct $a,b\in Y$ there exists a continuous $f:Y\to X$ such that $f(a)\neq f(b)$?  Thanks.


Have we ever observed two drosophila lineages that evolved reproductive isolation in labs?

Background  The standard definition of species refers to the concept of . If two lineages are found to be reproductively isolated, then we consider these two lineages to belong to different species. My question concerns evolved reproductive isolation in Drosophila sp. following labs due to experimental evolution.  Question  Have we ever demonstrated that two Drosophila sp. lineages that could initially interbreed (in nature or in labs) evolved through artificial selection (and drift and mutations) in labs to finally not be able to interbreed anymore either due pre- or post- zygotic isolation (see )? Or, in other words, have we ever demonstrated that two drosophila lineages evolved to become different species (reproductive isolation definition) in labs experiments?  If not, have we ever observed some partial reproductive isolation such as inbreeding depression for example?    Note: This question is motivated by @LotusBiology that could not receive the answers she/he was waiting for because he/she failed to ask questions that are possibly answerable! So I wanted to ask this question that somehow addresses  question he/she asked (now on-hold)  For more information about the concept of species, please have a look at


Is there an app/solution to quickly send text snippets/links/images from Windows pc (clipboard) to your iPhone?

I constantly have the problem that I want to push a text snippets/links/images quickly from my Windows pc to my iPhone, without it being plugged or on the same Wi-Fi.  Every time, it seems to be a hassle. I send myself emails, or whatsapp messages.  There must be a solution. Does anyone know a remedy for this?


A property of finite field of order $2^n$

Suppose $a$ and $b$ are elements of a finite field of order $2^n$ with $n$ odd and $a^2+ab+b^2=0$. Is it necessary that both $a$ and $b$ must be zero ?  I understand that the field has characteristic $2$ but don't know how to use the fact that $n$ is odd, please help.


Use (or not) of appostrohe when making an abbreviated plural

We had a discussion the other day that needs settling. I am a medical student and in our "industry" we use a lot of three letter abbreviations such as: CPR (Cardiac Pulmonary Resuscitation), PUN (Patient Unmet Need), PEN (Practitioner Educational Need) etc. You get the message. Now, the other day our tutor wrote in a presentation: PENs, PUNs, CPRs and I argued (who am I to argue with the tutor?) that it should be PEN's, PUN's CPR's as we are pluralising an abbreviation. What is the rule (if any) about pluralising abbreviations? Dan


I already have the Taken King. What will happen if I install the Legendary Edition? Will it delete my save file?


Redirect all stderr of a console and subsequent commands to a file

I know how to redirect stderr to a file or to the stdout when I issue a command: command 2 > log or command 2 > &1 or even command 2 > &1 > /dev/null. However, I want to redirect all the stderr to a file since I open a bash console and thus all error messages of executed commands in the console would be redirected to that file. Is that possible? If so, what is the command to put in the .bashrc?


Why does the area of a bar in a histogram represent the frequency of that particular class

In a bar-graph, the height of the bars represent the frequency of a particular category but it is counter-intuitive that in a histogram, instead of the height of the bar(which represents the frequency density), the area of the bar represents the frequency of the particular class. Why is this so?


After upgrading to iOS 7, the + (plus) sign on my calendar is grayed out.  I cannot add new appointments. I even tried using Siri to add an appointment and the response is "Sorry, I'm afraid I can't do that."


How to make an endless div after a fixed height div?

Let's say I have 2 Divs.   The first one has a height of 100px. The last one should go from the end of the first one up to the end of the site.   I tried all what I know: When I set it to 100% it takes up the complete site, so 100px too much. When I try it without setting a height, I get only as much as I write into.


Can you concentrate on a special ability while also concentrating on a spell?

There exist several abilities that have the text similar to, this effect lasts while you maintain concentration (as if you were concentrating on a spell). One such example is the Bard College of Glamour: Mantle of Majesty ability.     At 6th level, you gain the ability to cloak yourself in a fey magic   that makes others want to serve you. As a bonus action, you cast   command, without expending a spell slot, and you take on an appearance   of unearthly beauty for 1 minute or until your concentration ends (as   if you were concentrating on a spell). During this time, you can cast   command as a bonus action on each of your turns, without expending a   spell slot.   Another example is the Cleric Trickery Domain: Channel Divinity: Invoke Duplicity ability.     Starting at 2nd level, you can use your Channel Divinity to create an   illusory duplicate of yourself.      As an action, you create a perfect illusion of yourself that lasts for   1 minute, or until you lose your concentration (as if you were   concentrating on a spell).   While you are concentrating on maintaining such an ability would you also be able to maintain concentration on a spell that requires concentration?  There does not seem to be any RAW that limits this however the limitation around concentrating on a second spell exists which may suggest that the intent is that a character cannot concentrate on 2 effects at the same time unless explicitly stated.


Is the "the ... the ..." construction governed by some grammatical rule?

a) The more I study, the less I learn. b) More I study, less I learn.  Could we rewrite the sentence shown under the letter a) in the form shown under the letter b) without breaking any grammatical rule? If not, why not?


Existence of Natural Solutions to Linear Diophantine Equation

If you have a Linear Diophantine Equation, $ax + by = c$, such that $a, b, c$ are constants is there an efficient way to check that there exists some pair $X, Y \in \mathbb N$?   I recognize that I could find every integer solution and then check for every pair if $(X, Y)$ are natural numbers, but this is very indirect and inefficient; I was wondering if there is a more direct and efficient manner to determine the existence of such a solution.


I have a macbook pro 2011 with high sierra  10.13.5  Today i tried renaming my admin account in the system preference / users. I couldn't rename the account, and i have lost the admin rights. Now i can access the account because i know the password.  I have the same problem described here : . I tried the solution described in that page. The problem is after rebooting, the setup screen to add a new account doesn't appear. Instead the mac reboots normally.  MacBook Pro, macOS High Sierra (10.13.5), MacBook Pro (13-inch, Early 2011)


Dependence of Axioms of Equivalence Relation?

This question is problem 11(a) in chapter 1 in 'Topics in Algebra' by I.N. Herstein.   These are the properties of equivalence relation given in this book.   Prop 1 $a \sim a$ Prop 2 $a \sim b$ implies $b \sim a$. Prop 3 $(a \sim b$ and $b \sim c)$ imply $a \sim c$.   Statement Property 2 of an equivalence relation states that if $a \sim b$ then $b \sim a$. By property 3, we have the transitivity i.e. $a \sim b$, and $b \sim c$ then $a \sim c$. What is wrong with following proof that property 2 and 3 imply property 1? Let $a \sim b$; then $b \sim a$, whence by property 3 (using $a = c$), $a \sim a$.    I think I can prove this to be wrong. Without proving equivalence relation first, one can not use $a = c$. Right? After all, equality is equivalent to 'equivalence relation' and 'axiom of substitution' are satisfied. If this is right, then I have trouble with the next part of this problem.    Part 2 Can you suggest an alternative of property 1 which will insure us that prop 2 and prop 3 do imply 1?  Can one give such a formulation without using the idea of '=' or otherwise?    EDIT : Italics are my comments. Rest is as it appeared in the book.  Notion of Equality  I have read in Terry 'Analysis 1' in Appendix A.7 published by Hindustan Book Agency that there are four axioms of 'equality'. First 3 are same as equivalence relation where $\sim $ in replaced by $ = $. The fourth one is known as axiom of substitution. Given any two objects $x$ and $y$ of some type, if $ x = y $, then $f(x) = f(y) $ for all functions or operations $f$.


Book (or series) about a boy who sees "mirrors"

I read a book quite a long time ago (5-7 years) and I would love to revisit it but I can't remember the name anymore.  It was a about a boy who saw "mirrors" flowing around. Later on, he found out these mirrors actually were portals where demons came through. At one time a demon came through a portal a ripped his whole class apart.  He had a young brother who got kidnapped but when he went through the portal to save him he found out he never had a little brother and this was a demon too.


Why are site stats graph for beta sites not available to public?

Currently, on all beta sites, the current site stats is placed prominently on the front page, which is great for knowing how the site is currently doing.  However, it doesn't say anything about the trend of the numbers - whether the site is sailing or it is sinking compared to the last month. According to Madara Uchiha, our moderator on Anime & Manga SE, . Disregarding data which are not already public, , I can't see any reason why we are not allowed access to graphical representation of public site statistics. In fact, there is already a third-party app that scraps the information from the home page and . Can we have a beautiful visualization on how our beta sites evolve over time, from pony to unicorn?   Images stolen borrowed from Bulbapedia


My question: is there any way that wa can generate a word output file from latex ?  Input : latex file output: word file instead of pdf  Thank you in advance


is my php code vulnerable to sql injections

a friend of mine told me that using this script to authenticate users is real risk to sql vulns  <?php if(strlen(strstr($_SERVER['HTTP_USER_AGENT'],"-- IPB Vaidation  --")) <= 0 ){  die('Login Failed!, Please try again.'); } $name = strtolower($_GET["name"]); $password = $_GET["password"]; $digits = $_GET["digits"]; $random_number = 70;  $sum_total2 = $digits * $random_number; $con = mysql_connect("127.0.0.1","usernamehere","passhere"); if (!$con)   {   die('Could not connect: ' . mysql_error());   } mysql_select_db("database here", $con); $sql = "SELECT * FROM ipbmembers WHERE members_seo_name='{$name}'"; $result = mysql_query($sql) or die(mysql_error()); while($row = mysql_fetch_array($result))   {   $trueHash = $row['members_pass_hash'];   $salt = $row['members_pass_salt'];   } $hash = md5(md5($salt) . md5($password)); if($hash == $trueHash) { echo "Thank you for logging in"; echo ($sum_total2); } else { echo "Login Failed!, Please try again."; echo ($sum_total2); }   ?>   can anyone show me how its done? or what iam doing wrong?      Thanks!


Do you get the war loot bonus if you get 1 star on a base that someone else has alread 3 starred?

I have been playing clash of clans, and I want to 1 star a farming person in war and get a ton of loot. (I can't do any better to anyone else). My clan says to wait until the near end of the war, but idk if I will still get loot if someone already got at least 1 star.


Finitely generated field is a finite field

A ring $R$ is said to be finitely generated if there exists a finite subset $A$ of $R$ such that for all rings $R'\subset R$ with $A\subset R'$ we have $R'=R$. ($A$ is called the generating set of $R$)  Following is the statement that I want to prove:     If $F$ is a field which is finitely generated as a ring, then $F$ is a   finite field.   This is supposed to follow as a corollary to the general Nullstellensatz (Eisenbud, Theorem 4.19)  Theorem: Let $R$ be a Jacobson ring. If $S$ is a finitely generated $R$-algebra with the ring homomorphism $\varphi: R\to S$, then $S$ is a Jacobson ring. Further, if $J\subset S$ is a maximal ideal, then $I = \varphi^{-1}(J)$ is a maximal ideal of $R$, and $S/J$ is a finite field extension of $R/I$.   If $F$ is a field of characteristic $p$ then the result follows by taking $R=\mathbb{F}_p$ and $S=F$ in the above theorem. But, how to show that $F$ can't be of characteristic $0$?


Windows time resets even when doing the fix

I am dualbooting ubuntu 13.10 and windows 7. When I boot into ubuntu and then into windows, the windows time is +2 hours of the correct time.  I know this has to do with the way the operating systems handle BIOS time. For ubuntu it is UTC and for windows is local time.  So I searched about it and found that i need to make a .reg file with these contents and then run it.  Windows Registry Editor Version 5.00  [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]      "RealTimeIsUniversal"=dword:00000001   But it doesn't work. Even if I do it, after some time windows changes the clock again to +2 hours... I also tried rebooting immediately after doing the fix, but still nothing.


In QM it's taught that the frequency of a photon emitted when an electron drops from a higher-energy state to a lower-energy state is $\Delta E/h$. In E&M, it's taught that the source of an electromagnetic wave is the acceleration of charge -- and that the frequency of the wave is the same as the frequency of oscillation in the acceleration of charge.    Is there a clear explanation of how the electron's motion generates the frequency when an electron drops from one energy state to a lower energy state in an atom?  Of course, I realize that the electron is really a wavefunction, not a particle, but still, some component of the electron (or electron wavefunction) must oscillate at the frequency $E/h$ during the transition from the high state to the low state.  What is that component?


How do I set a user profile pic in GNOME?

I simply want to get an image in gnome like this one:    And here is how mine looks like:      To clarify, I want to add my name near the arrow as above and when I click on it I want to get an image I choose. Like the image above of "wanda".  So how can I set an image like this?


How to downgrade from ubuntu 15 to ubuntu 14 to escape systemd?

Is it possible to downgrade from ubuntu 15 to ubuntu 14?  We would like to stay on 14 until we have decided on a distro to replace ubuntu that does not use systemd.  How is that done?


I noticed that when I post a question, there's always at least one view  Asked today   Viewed 1 times   Is the 1st view always the OP?


A and B is similar ⇒ $A^T$ is similar to $B^T$.

Prove that, if A and B is similar, then $A^T$ is similar to $B^T$.  Attempt: I try to use the defn of similarity, and then the rule to transpose in different order, but get nowhere. This should be simple...  (Note to self: page 92.)


Detect Windows Server version 32/64-bit in CLI

What's the best and quickest way to detect whether you're running a 32 or 64-bit version of Windows Server from the command line?  (Cygwin is installed)


Using stepAIC to help select final model

So I have a full model such as; model4 <- glm(N~a+b+c+d+e+f+g, family=binomial, data=df)  and then I did the `stepAIC` function to see which would be the best simplest model and the output looked like this:    Start:  AIC=3153.44   N ~ a + b + c + d +       e + f + g                   Df Deviance    AIC             - d  3   3117.4 3149.4 <none>                   3115.4 3153.4                - a     1   3118.6 3154.6                  - c       1   3121.2 3157.2                        - f  1   3121.3 3157.3                      - b       1   3145.0 3181.0                       - e      7   3192.8 3216.8                     - g           4   3414.3 3444.3     Step:  AIC=3149.36  N ~ a + c + f + b + e + g                   Df Deviance    AIC  <none>                 3117.4 3149.4              - a     1   3120.3 3150.3              - c      1   3122.8 3152.8              - f      1   3124.1 3154.1               - b      1   3146.2 3176.2               - e       7   3211.3 3229.3            - g           4   3419.6 3443.6      Call:  glm(formula = N ~ a + c + f + b+e+g     family = binomial, data = df)   So what I can gather obviously is the last call part to be the best ranked Model. However, the difference between the two best "ranked" models is .9 of a difference and therefore is within the 2 mark for AIC competitiveness. Why cant I pick the second best ranked AIC that has the fewest models then? So instead of having a model that has 6 predictors and an AIC of 3149.4, why cant i have the model that has 5 predictors and an AIC of 3150.3? I'd really someone to explain this for me as I'm clearly still learning and I always thought you wanted the best most simplest model.


How can I get equivalent python code for a created blend file from blender. I want to generate java code for corresponding python code of a blender. I am unable to get python code of blender file either inside or outside the blender.


Poisson regression for modeling standardized mortality ratio (SMR)

I have a data set with individuals with a certain diagnosis who are observed from the time of their diagnosis until death or the end date of the study. I want to calculate SMR for the whole group, and also compare subgroups (especially sex and year). My question  regards whether the methodology I describe is sound, and I'd be happy if someone could provide some references (articles or books) where I can read about this specific methodology.  The data is standardised with census data and here are the first six (of 384) rows of data:  year sex   age_group  observed_deaths  expected_deaths 2006   0       15-19                0          0.01480 2006   0       20-24                0          0.05848 2006   0       25-29                3          0.04836 2006   0       30-34                1          0.03835 2006   0       35-39                0          0.06424 2006   0       40-44                2          0.11880   Expected deaths are calculated from the census number of deaths in each year/sex/age group stratum and the person-years of observation time in each stratum.  So the basic method to calculate SMR is to divide the sum of observed deaths (O) with the sum of expected deaths (E). O/E in this case (for the full data set) is 8.68. The standard error is, to my understanding by dividing the square root of O by E, so the confidence intervals using this method are 8.19-9.18. Calculating SMR for each sex is simply done by summing observed and expected deaths for each sex separately, and performing these calculations with each pair of O and E.  So far so good, but I'd like to assess whether there is a difference between sexes as well as a difference between different years of study. If my understanding is correct, this could be done using Poisson regression. So if I start by calculating the basic SMR without taking sex or year into account:  glm(observed_deaths ~ offset(log(expected_deaths)), data=data)   This gives the same SMR at 8.68, but slightly different confidence intervals at 8.20-9.19. Calculating SMRs for each sex is easily done:  glm(observed_deaths[sex==0] ~ offset(log(expected_deaths[sex==0])), data=data) glm(observed_deaths[sex==1] ~ offset(log(expected_deaths[sex==1])), data=data)   And now, I haven't read about this but it seems like I could just add sex as a covariate and get a statistical test for the difference in SMR between the sexes:  glm(observed_deaths ~ offset(log(expected_deaths)) + sex, data=data)   Or if I want to assess a linear effect of time on the log SMR:  glm(observed_deaths ~ offset(log(expected_deaths)) + year, data=data)   Is this methodology sound and valid? I understand that this operates on the assumption that the SMR is the same in all strata not included in the regression model, but that assumption must reasonably be implicit in the simple method (without the use of Poisson regression) as well?  Can anyone point me to some useful references where I can read more about the use of Poisson regression models when calculating SMRs?


Displaying and updating a counter in bash

I think it's something like  this: (Fedora14/bash)  #!/bin/bash  for i in {0..10..1}; do echo -e "$i"'\c' echo -e "\n\r" sleep 1 done   But it doesn't work. Purpose: like this, but without the "clear":   #!/bin/bash  for i in {0..10..1}; do echo -e "$i" sleep 1 clear done   So a counting script that doesn't deletes the whole screen to output +1 number, instead it only deletes the line, where the counting is, so that there could be ex.: a beatifull "progress bar"..


Why do Walkers' abilities change from season to season?

In season 1 walkers can pick up rocks and break windows, climb fences and appear to look around. in later seasons they only walk and are easily distracted by noise. Why have their abilities changed?


Prompt for sudo password rather than give access error

Can I configure Fedora 22 so anything needing root privileges asks for a password, rather than giving an error, and needing me to re-run with sudo?  I wouldn't even mind having to type my password every time, without the few minute (or whatever it is) timer that it remembers the password for.  i.e. Instead of:  $ dnf history You don't have access to the history DB.   It would:  $ dnf history [sudo] password for <username>:   I think some of the gui apps do that, like the gui yum frontend back when I had that installed.  I'm thinking not... That it would be up to each app to implement this.  But, I'm hoping it might instead be that apps say root privilege is needed, and there might be some way for the kernel (or wherever else) to remain in a blocking input stage (for the password) before returning whether the user has access.


Not much about the underlying math, but how can an electromagnetic field exist when the electric and magnetic field is zero?


Puppet on Azure to manage non-Azure nodes

I have installed a Puppet Server on Azure and is currently managing a number of Puppet Agents on Azure as well. I am using the internal azure fqdn - this means that all manifests and tasks processes are sent using the internal Azure network.  Now I want to use the same Puppet server to manage nodes outside Azure. However when I use the public DNS of puppet server, the agent is failing due to incorrect CA domain.  Is there a way to specify to CAs in Puppet server? One for Azure hosts, and other for non-Azure hosts?


Installation of Ubuntu Gnome 16.04 fails - USB error, graphics error?

I currently have Ubuntu 14.04 installed, but I want a fresh start. I am going to wipe the drive and install Ubuntu Gnome 16.04. Unfortunately I'm having no success at all.  I downloaded ubuntu-gnome-16.04.3-desktop-amd64.iso (the md5 checksum matches) and installed it to a new USB drive. My BIOS allows for both a Legacy Boot and a UEFI boot. I've posted the results when I drive to boot both as Legacy an UEFI below. I'm not sure how to solve these issues. I've tried a different USB drive, and different ports.  My video card is a NVIDIA Corporation GM204 [GeForce GTX 970].  Is this possibly a problem with the boot process, the USB, graphics drivers?   Legacy boot results  I get the gfxboot.c32 error. I hit [Tab], then I tried live and live-install. Both result in this error    UEFI Result  This is the screen that is produced. It flickers a bit, then just remains in the image I show here.


Interesting integral related to the Omega Constant/Lambert W Function

I ran across an interesting integral and I am wondering if anyone knows where I may find its derivation or proof.  I looked through the site. If it is here and I overlooked it, I am sorry.  $$\displaystyle\frac{1}{\int_{-\infty}^{\infty}\frac{1}{(e^{x}-x)^{2}+{\pi}^{2}}dx}-1=W(1)=\Omega$$  $W(1)=\Omega$ is often referred to as the Omega Constant. Which is the solution to   $xe^{x}=1$.  Which is $x\approx .567$  Thanks much.   EDIT:  Sorry, I had the integral written incorrectly. Thanks for the catch.  I had also seen this:  $\displaystyle\int_{-\infty}^{\infty}\frac{dx}{(e^{x}-x)^{2}+{\pi}^{2}}=\frac{1}{1+W(1)}=\frac{1}{1+\Omega}\approx .638$  EDIT:  I do not what is wrong, but I am trying to respond, but can not. All the buttons are unresponsive but this one. I have been trying to leave a greenie and add a comment, but neither will respond. I just wanted you to know this before you thought I was an ingrate. Thank you. That is an interesting site.


Determine the set of units $(\Bbb Z/n\Bbb Z)^\times$ for different values of $n$

(a) Determine the set of units $(\Bbb Z/n\Bbb Z)^\times$ for $n = 4, 9, 15, 16$.      (b) For which pairs of natural numbers m and n does there exist a ring homomorphism $\Bbb Z/n\Bbb Z \to \Bbb Z/m\Bbb Z$?    Where $\Bbb Z$ = set of integers.   My attempts:  a) I know that $a$ in $\Bbb Z$ is a unit if there exists $b$ in Z such that $a.b = b.a = 1$ where $b$ is the inverse of $a$.   So for $n=4$, $(\Bbb Z/4\Bbb Z)$ ={$0,1,2,3$} and $(\Bbb Z/4\Bbb Z)^\times$ = {$(1.1),(3.3)$} where "." represents multiplication.  And for $n=9$, $(\Bbb Z/9\Bbb Z)$ = {$0,1,2,3,4,5,6,7,8$} and $(\Bbb Z/9\Bbb Z)^\times$  = {$(1.1), (2.5), (4.7), (7.9), (8.8)$}. I'll do the same procedure for $n= 15$ and $n=16$.   But is the above correct?   And could you please show me how part b) is done? We didn't talk about it in the lecture


How can I choose hexadecimal web colours (like #000000 and #fffff) to use in system and third party apps? (e.g. an image editor like GraphicConverter)


Is there a known mathematical constant for the formula $f(x)=\sum_{n=1}^\infty(\prod_{m=1}^{n}(\frac{1}{m}))$?

I'm not a mathematician nor do I otherwise use it seriously, but every once in a while I just play around with a formula that I generate (usually to look complex or designed to get really big [like a factorial function]), but this time, I think I found something interesting. I generated the following formula: $$f(x)=\sum_{n=1}^{x}(\prod_{m=1}^{n}(\frac{1}{m}))$$ I plugged into Desmos (originally, I was testing if they had fixed their summation and product functions on their graphing calculator) and I realized that the limit was some constant. I decided to explore this myself and, to speed up the process, I plugged in $10$ for $x$ and I got something close to the constant: $$\sum_{n=1}^{10}(\prod_{m=1}^{n}(\frac{1}{m}))\approx1.7182\ldots$$ If we plug in 100, instead, we get a similar value: $$\sum_{n=1}^{100}(\prod_{m=1}^{n}(\frac{1}{m}))\approx1.7182\ldots$$ Seeing this, I was curious about mathematical constants. I know that $\varphi=\frac{1+\sqrt{5}}{2}\approx1.6\ldots$ and $\sqrt{3}\approx1.732\ldots$, so this constant must be represented as the following: $$\varphi\leq c \leq\sqrt{3}$$ Is there a constant here, or did I just discover something (probably useless) here? If there is a constant here, what is it used for? If not, then are there potential uses?


Failed to load the GDAL native libs for GeoServer 2.15.0

2 days searching and looking for a guideline to enable GDAL extension for GeoServer, I found many questions here and I followed all steps, but unfortunately the problem still exist the default raster extension not changed.  I just need a clear guideline how to enable GDAL, ECW, MrSID extensions for GeoServer 2.15.0   edit: error message   WARNING: Failed to load the GDAL native libs. This is not a problem unless you need to use the GDAL plugins: they won't be enabled.


We're trying to debug some applications performing broadcast.  What is the difference between the broadcast address 255.255.255.255 and as e.g. reported by ifconfig,  Bcast:192.168.1.255


Why isn't this regular expression test working?

I have this  echo $line Thisisaline.   I was wondering why is this not working:  if [[ "$line" =~ "[a-zA-Z]+\.$" ]] ; then echo "hello"; fi   Above regex gives no output.


How to secure database passwords in PHP?

When a PHP application makes a database connection it of course generally needs to pass a login and password. If I'm using a single, minimum-permission login for my application, then the PHP needs to know that login and password somewhere. What is the best way to secure that password? It seems like just writing it in the PHP code isn't a good idea.


Going to the USA on a reason different from what I said when getting a visa

I recently acquired a B1/B2 visa for two years on grounds of attending an environment conference in California, however the conference will not take place as scheduled, So can I visit another state such as Colorado to visit someone?


How can one correct intensity flicker due to AC line frequency?

Is there a good image processing method to get rid of the horizontal stripes in the images taken under fluorescent lighting? These stripes (flicker) occur when you take pictures indoors due to the 50 Hz (Europe) or 60 Hz (US) AC line frequency, and they reflect in the image as twice of this frequency (either 100 Hz or 120 Hz). One commonly suggested way is to choose a synchronized shutter speed (exposure time) such as 1/50s (1/60s) but how would you go about it, if the pictures are taken at an arbitrary shutter speed and you want to fix it in the post-processing?   Here is an example picture that displays the phenomenon:


Trying to print a casted array of ints into chars,but I get message "integer number too large"

Hello guys I just started learning java and I'm got my name in ascii numbers in a int array and i'm trying to loop thru it while casting each int ascii to a char  package program1;  /**  *  * @author Gust-X  */ public class Program1 {      /**      * @param args the command line arguments      */     public static void main(String[] args) {          int[] firstName;         firstName = new int[6];          firstName[0] = 071;         firstName[1] = 117;         firstName[2] = 115;         firstName[3] = 116;         firstName[4] = 097;         firstName[5] = 118;           for(int x = 0; x < 6; ++x ){             System.out.print((char)firstName[x]);         }         // TODO code application logic here     }  }   I get a red line under firstName[4] = 097; saying integer number too large 097


320gb hdd all ubuntu, want to partition and add win 7

I am using Ubuntu 14.04  blkid= /dev/sda1: UUID="05cd7e6a-caf1-44bc-9900-92ec14c5ea34" TYPE="ext2"   /dev/sda5: UUID="J450yI-3go9-4Ps2-kdQm-lNH7-Go3J-FrvhOm" TYPE="LVM2_member" /dev/mapper/ubuntu--vg-root: UUID="9cd5d111-ec03-4298-803a-a65fdc8790ea" TYPE="ext4" /dev/sdb: LABEL="UDF Volume" TYPE="udf" /*This is Win 7 install*/   This is system monitor file system output:  Device                         Directory     Type  Total   Available /dev/mappper/ubuntu--vg-root   /             ext4  310.6GB 240.1GB /dev/sda1                      /boot         ext2  246.8MB 135.3MB /dev/sdb                       /media/name/udf     3.2GB   0 bytes   I would like to partition the first drive and install win 7 from sd card at /dev/sdb I am novice level, but am comfortable and competent to cut and paste into terminal. Open for suggestions for another method, no floppy drive but plenty of blank cd's and usb drives and sd card capacity.


What is the quantum mechanical explanation of the octet rule?

What is the quantum mechanical explanation of the ? In other words, what makes the octet rule be true from a quantum mechanical view? How we explain  what makes some atoms don't follow the octet rule using QM?


How to calculate $\lim_{x\to 1^+} \log (x)^{\log(x)}$?

How to calculate $\lim_{x\to 1^+} \log (x)^{\log(x)}$ ? i know that its "1", but why? How can i calculate this?  Thank you very very much =)


Why do water drops form spheres in space?

When water is poured out in space, why does it always take a spherical ball-like shape?


I was checking my progress in the review queue's and discovered that they're looking at an 8 day windows to report the weekly review total.  160 reviews at 20 reviews/day is 8 days of activity not 7.  This is from the Low Quality Review queue on StackOverflow.  I get the same for Suggested Edits; the other queues I either don't have enough reviews to see anything obviously wrong with the total or don't have access to at all.


I am working on a Double Leaf Bascule bridge spanning across a river that needs rehabilitated. The bridge is driven from a ControlLogix PLC consisting of 4 racks on the nearside span. Power/control is sent to the farside span via a single submarine cable installed in 1987. We are attempting to install a 5th I/O rack on the farside span to control various relays/encoders. The problem is there's no ethernet cable inside the submarine cables for the farside I/O rack. The options are to use either a Coaxial cable (RG-11) or a shielded twisted pair. Could we install a media converter on both spans (ethernet->coax->ethernet) to communicate with the farside I/O rack?


How to escape single-quote (apostrophe) in string using php

I have a SQL query like this:-  $stmt = $pdo->prepare(    "SELECT * FROM `products_keywords` WHERE `product_type` = '" . $product_type . "' ");   I don't know what will be the value in the $product_type variable. But Now, I am getting Men's Shirt in $product_type variable which is causing the syntax error in my SQL query. I am sure this error is due to the single quote in Men's Shirt value. How I escape this value according to my query? And how to check if there is single quote in my $product_type variable and then escape it according to my query. Thanks in advance.


Choosing EC2 instance for image processing

I am planning to use m1.small in Elastic Beanstalk for the image processing of my app. It can scale behind a load balancer and provide more processing power when the app needs to based on specific metrics.  I also considered using m3.medium which is more optimized for compute intensive application like image processing. The problem is that my application runs on ASP.NET 4.5 and when running on Windows 2012, I assume that the m3.medium 4GB SSD drive won't work for this type of instance.  The other option is m1.medium that has 160GB of storage space but less powerful than the m3.  Which server considering that I need to run my application on Windows and I am running it behind a load balancer (Elastic Beanstalk) and can add remove servers using auto scale, which one do you recommend for image processing?


Unable to compare time with custom Function Google App Script

I'm creating a custom function where I would like to update the start time of a schedule depending if they had Overtime. For example, Employee1 entire schedule is from 8:45 AM - 7:00 PM, however this person had Overtime before his real shift started, so I'm trying to update his start time based on that, but when I try to compare the start time with the Overtime start time, for some reason even when they both are equal, the script doesn't recognize them, below my code: function calculateStart(shiftStart, shiftEnd, scheduleState, scheduleStateStart, scheduleStateEnd) {   var newScheduleState = [];   var res;   var newShiftStart = "Start";   var sLen = scheduleState.length;      //Creating new array that contains only the schedule information for one day   for (i = 0; i < sLen; i++) {     res = String(scheduleState[i]).slice(0, 3);     if(res != "Req"){       newScheduleState.push(scheduleState[i]);     }else{       break;     }   }    //Checkig if shiftStart needs to be updated based on Overtime   sLen = newScheduleState.length;   for (i = 0; i < sLen; i++){     if(String(newScheduleState[i]) === "Overtime"){       newShiftStart = "Yes, this is overtime";     //NOT SURE WHY the next line is false      if(shiftStart == scheduleStateStart[i]){       newShiftStart = "Yes, they are the same" + shiftStart + ' - ' + scheduleStateStart[i];       if(String(newScheduleState[i+1]) === "CLINIC"){         newShiftStart = "End Clinic"         //newShiftStart = scheduleStateEnd[i+1];       }else{         newShiftStart = "Overtime"         //newShiftStart = scheduleStateEnd[i];       }     }else{       newShiftStart = "Not the same " + shiftStart + ' --- ' + scheduleStateStart[i];     }     }   }   return newShiftStart;   // Returns: Not the same Sat Dec 30 1899 09:47:04 GMT-0500 (GMT-05:00) --- Sat Dec 30 1899 20:02:04 GMT-0500 (GMT-05:00) }  And below and image of the parameters:  Adding a


mail: send email with attachment from commandline

I know how to send an email from command line (script)  echo "body" | mail -s "subject" my@email.com   Is it possible to send attachments from commandline (script) as well?  I am using heirloom-mailx on Debian Wheezy.


Show that $e^{\ln(z)}$ always equals $z$, but $\ln(e^z)$ does not always equal $z$.

Using, Euler's identity, we get:  $z = r.e^{i\theta}$Then, do we need to use the fact: $\theta = \theta + 2n \pi, n \in \mathbb N$ ? I am unable to get to the proof..


What is the best way to show that the exponential sequence doesn't uniformally converge on an unbounded interval

Say we use the usual definition of $$E_n(x)=1+x+...+\frac{x^n}{n!}$$  I know that on any bounded interval it converges uniformly, I am trying to show that it does not converge uniformly on $[0,\infty)$  I know that uniform convergence maintains boundedness so I am thinking it will definitely have to do with that, but I am just not sure the best way to show it without using things like convergence of series.  Any help?


Adding new item to recommender's options?

My shop has 20-items with a recommender system on top which analyses history of purchases and recommends items to buy each time customer returns.   Now I want to add an additional item to choose from, which I have no history about previous purchases (let's say customers purchased it from my competitor). In a while, I will  add this new item to recommender engine, but I'm afraid it will think that the item is less popular than 20-items with good history.  I guess I need to add some kind of adjustment to recommender engine, and (as  I'm newbie to recommender system)  what kind of adjustments should I look at/google for? Should I look at cold-start problem, like was proposed ?


Since my first Windows 98 (and even now on Win7), I could enter the first 6 letters (symbols) of a folder's name and add ~1 after it (when there was just one folder with those six letters in current directory), and it would work as the full name of it. And it appears that if there are more than one folder with the same six first symbols in its name, I can use FOLDER~2 and so on, and it will open the corresponding folder, as if I entered its full name. Like c:\progra~1 will open C:\Program Files and c:\progra~2 will open C:\Program Files (x86) on win7 64 bit.  How does this work?


I am using the basic PHP hash function to hash a password. Is the password secure enough/future proof? Or is there a industry standard on how php password sha512 hashing would be implemented? The hashed passwords are are not encypted (open to the public), so it must be super crack-proof. Thanks for your suggestions.   $password = 'passw0rd' hash('sha512', $password)     I would like to use crypt(), but I have php 5.1.4 which means that: Standard DES: stqAdD7zlbByI  Extended DES not supported.  MD5: $1$somethin$4NZKrUlY6r7K7.rdEOZ0w.  Blowfish DES not supported.  SHA-256 not supported.  SHA-512 not supported.  What options do I have now?


Animating masks to create multiple wipes

So... I'm making yet another video. And I want to recreate this effect:  (its in the first 15 seconds) So I have kinda the general idea of how to do this, which may be complete reduntant. My thought is to have 2 planes scaled out on the x axis and y axis, and animate their location, than to put the scene into VSE or MCE, and have video #1 be in the top left, video #2 in the top right, and so on. And I think if I could somehow parent a mask to an empty that is parented to the plane, that would work.   So my question is how do I parent a mask point to an object? Any help GREATLY appreciated!!!  EDIT: Ok, so I'm realizing that parenting masks to an object isn't really going to work. I'm going to use objects in the 3D scene and use the alpha layer to do the masking. But I don't know how to use just the alpha in the VSE. Help?


How do I schedule Mac OS X Leopard to wake up multiple times in one day?

The "Energy Saver" panel in System Preferences allows the user to schedule wake ups. The only problem is is that the most frequent it allows for this to happen is ONCE per day. Is there any way or any tool or any software that can make it wake up at any custom interval? I'm running Mac OS X 10.5.8.


Why should I declare a virtual destructor for an abstract class in C++?

I know it is a good practice to declare virtual destructors for base classes in C++, but is it always important to declare virtual destructors even for abstract classes that function as interfaces? Please provide some reasons and examples why.


Return List - Issues problems in .net core 2.0

It's like I'm just trying to get some content on my layout page for which will appear in the menu.  Right now, it only presents problems as it does not show it.  It looks like this in my "Helper" class that displays menu content.  public readonly DBContext _dbContext;      public HelperViewClass(DBContext context)     {         _dbContext = context;     }      public static List<ContentInfo> ListMenu()     {         return _dbContext.ContentInfo.Where(i => i.ShowMenu == true).OrderByDescending(i => i.Id).ToList();     }   Error: An object reference is required for the non-static field, method, or property 'HelperViewClass._dbContext'  How should it be?  What I want this piece to do is send the content back with showmenu == true. That's just what it's supposed to do.


How to get a blurred background using a Canon 18-55 STM lens?

I'm totally new to photography and need your help.  I've read much about ISO, Aperture and Shutter speed. I know to get a blurred backround: use a wide aperture. Also I know the distance between camera and object is important.   But every single time I've tried to get a blurred background, I've achieved nothing! I was thinking maybe it's not possible to have this effect with a 18-55mm STM lens at all. This is on a Canon 70D  Is that right? If not, what is your recommended setting to get a blurred background?  Best shot I could get is this. f/5.6, 1/250, ISO auto:


Good or Bad: 'where 1=1' in sql condition

Why would someone use WHERE 1=1 AND <conditions> in a SQL claus. I don't understand why would someone use this construction for defining a view, or use it inside a stored procedure.  for example:  select * from user where 1=1


I am stuck on level 35. I need 3 friends to unlock the level, but I have tried sending the request and none have received my request.  How do I unlock the level?


I have two binomial (success=1 and failure=0) datasets and intend to apply a statistical test to show whether they are statistically equivalence or not. First dataset (x) includes around 164 data points in which 58 of them are "1" and the rest are "0". The second dataset/group (y) consists of 280 data points in which 113 of the are "1" and the rest are "0".  I applied the following test in r:    equivalence::tost(x,y,paired = FALSE, epsilon=0.15,conf.level = 0.95, alpha = 0.05)   And I got the following  results:     data:  x and y    df = 348.24    sample estimates:    mean of x mean of y     0.3536585 0.4035714      Epsilon: 0.15     95 percent two one-sided confidence interval (TOST interval):    -0.12840509  0.02857931    Null hypothesis of statistical difference is: rejected     TOST p-value: 0.01809221    Regardless of the epsilon value (which is somehow high! and shows the difference between the mean of two population), I think this function is for another type of data, Not binomial data. Does anyone know, Is this the right function to test the equivalency and if not, is there any other test which is appropriate for Binomial data?  I also applied the following test as @user2974951 suggested:   prop.test(c(58, 113), c(164, 280),alternative = 't')   And I got these results which I can not interpret:   data:  c(58, 113) out of c(164, 280)  X-squared = 0.88749, df = 1, p-value = 0.3462  alternative hypothesis: two.sided  95 percent confidence interval:  -0.1477880  0.0479622  sample estimates:   prop 1    prop 2  0.3536585 0.4035714


While Groot is a formidable brawler, he is not impervious (he is made of wood, after all), and often finds himself reduced to nothing but kindling.  Thankfully, planting even a splinter of Groot's remains allows him to regenerate and regrow.   How long does it take for Groot to regrow to "full" size? Can multiple splinters of Groot be replanted? Would this result in multiple Groots?


How does the Lorentz group act on a 4-vector in the spinor-helicity formalism $p_{\alpha\dot{\alpha}}$?

Given a 4-vector $p^\mu$ the Lorentz group acts on it in the vector representation: $$ \tag{1} p^\mu \longrightarrow (J_V[\Lambda])^\mu_{\,\,\nu} p^\nu\equiv \Lambda^\mu_{\,\,\nu} p^\nu. $$ However, I can always represent a 4-vector $p^\mu$ using left and right handed spinor indices, writing $$ \tag{2} p_{\alpha \dot{\alpha}} \equiv \sigma^\mu_{\alpha \dot{\alpha}} p_\mu.$$ So the question is: in what representation does the Lorentz group act on $p_{\alpha \dot{\alpha}}$?    There are a lot of questions about this and related topics around physics.se, with a lot of excellent answers, so let me clear up more specifically what I am asking for.  I already know that the answer to this question is that the transformation law is  $$ \tag{3} p_{\alpha \dot{\alpha}} \rightarrow (A p A^\dagger)_{\alpha\dot{\alpha}}$$ with $A \in SL(2,\mathbb{C})$ (how is mentioned for example in ). I also understand that $$ \tag{4} \mathfrak{so}(1,3) \cong \mathfrak{sl}(2,\mathbb{C}),$$ (which is explained for example  by Edward Hughes,  by joshphysics,  by Qmechanic).  So what is missing? Not much really. Two things:   How do I obtain (3) and what is the specific form of $A$, i.e. its relation with the vector representation $\Lambda^\mu_{\,\,\nu}$? Defining the following $$ (\tilde p) \equiv p^\mu, \qquad \Lambda \equiv \Lambda^\mu_{\,\,\nu},$$ $$ \sigma \equiv  \sigma_{\alpha \dot \alpha}, \qquad \hat p \equiv p_{\alpha \dot \alpha},$$ we can rewrite (1) and (2) in matrix form as $$ \tag{5} \hat p \equiv \sigma \tilde p \rightarrow \sigma \Lambda \tilde p  = ( \sigma \Lambda \sigma^{-1}) \hat p,$$ however, this disagrees with (3) which I know to be right, so what is wrong with my reasoning? Why does the transformation law (3) has a form $$\tag{6} A \rightarrow U^{-1} A U,$$ while the usual vector transformation (1) has a form $V \rightarrow \Lambda V$? I suspect this comes from a similar reason to that explained  by Prahar, but I would appreciate a confirmation about this.


How to draw the Smith-Volterra-Cantor set by tikz?

How to draw the similar Smith-Volterra-Cantor set ()? It is formed basically by removing 4^{-n} from the middle of every interval at level n, starting from the unit interval [0,1]. Here is an image of the Smith-Volterra-Cantor set from wiki:    I did not succeed in making an analog of the codes for Cantor set ().


I would like to make note paper, such as this   in LaTeX. I know that you can achieve this with TikZ. I wanted to ask if there exist dedicated packages for this purpose. Or do you have other hints?


Why do the first 10 Doctors (Hartnell-Tennant) have to forget the events of the 50th anniversary special, but the 11th and 12th Doctors do not?

In the 50th anniversary special, after Gallifrey is saved this conversation happens:  WARRIOR: So I won't remember that I tried to save Gallifrey rather than burn it. I'll have to live with that. DOCTOR 10: I won't remember either, so you might as well tell me. DOCTOR: Tell you what? DOCTOR 10: Where it is we're going that you don't want to talk about.  So I'm really confused. Why do the first 10 Doctors, William Hartnell, Patrick Troughton, Jon Pertwee, Tom Baker, Peter Davison, Colin Baker, Sylvester McCoy, Paul McGann, John Hurt, Christopher Eccleston, and David Tennant,  have to forget the events of the episode, but Matt Smith's and Peter Capaldi's Doctors can be the only ones to remember? Every Doctor should remember saving Gallifrey but only Smith's and Capaldi's can remember which is weird.


How does Newton's 3rd Law apply to arm wrestling?

I understand that when we refer to Newton's third law, forces do not cancel out because action-reaction pair forces are acting on different objects. I tried to apply this to arm wrestling, but I am a little confused.   Let's say you have box A on the left and box B on the right (representing the arms). Box A exerts 50 N towards the right. Box B exerts 40 N to the left. I.e. $\text{Force}_{AonB} = 50N$ and $\text{Force}_{BonA} = 40N$. Applying Newton's third law now, $\text{Force}_{BonA} = 50N$ and $\text{Force}_{AonB} = 40N$. Thus there is a net force of 90N in each direction.   What is my misunderstanding here?


Group Epimorphism from $\mathbb{R}$ to $\mathbb{Q}$

Is there a group epimorphism $f$ from $(\mathbb{R},+)$ to $(\mathbb{Q},+)$? Surely $f(0)$ goes to $0$, but my problem is where to send elements of $\mathbb{R}\smallsetminus\mathbb{Q}$.


I've just started The Molecular Level mission and I chose to go through the BoS. I just built the stabilized reflector platform, but it doesn't show it as built. It still has the hovering marker above the workshop. I went to try to talk to Proctor Ingram and she just gave me her generic responses. I really don't want to go back to my last save because it's an entire 5-6 hours behind back at the Cambridge Police Station when the Prydwen first arrives. If anyone has any fixes for this, that would be awesome.


How can I find the domain and derivative of the function?

How can I find the domain of the following function $D(f)$  $$\int_{1/2}^{\sin(x)}e^{\arcsin t} dt$$  As well as the derivative for $ x \in (\frac{-\pi}{2}, \frac{\pi}{2})$


How can I use vertex colors as an input in my material?

I want to use vertex colors as a mix factor in my material. However when I chose Add->Input the option Vertex Colors doesn't show up. Why can I not access the vertex colors data? I want to avoid using any python scripts or any workarounds with the Attribute node if possible. Using Blender 2.8.


Zeros of partial sums of the exponential

I am trying to show that if $$f_n(z)=1+z+\frac{z^2}{2!}+...+\frac{z^n}{n!}$$ Then $f_n(z)$ don’t have zeros inside the unitary disk.  I have tryied to use Rouche’s theorem or use that in the limit the polinomial converges to the exponential, but i dont get hoy to do this.


When is the formula for the infinite geometric series valid

When is the formula $$S_{\infty} = \dfrac{a}{1-r}$$ valid?   Does |$r| <1$?


My machine was updated today to Ubuntu 16.04.2. However, the kernel is still "4.4.0-62-generic". What happened (it seemed that the principal advantage of the 16.04.2 version was the update of the kernel to 4.8) ? Do I have to make a fresh install ?


Why Do Some USB Cables Have Two USB Connectors at the End?

I've recently bought an external hard drive enclosure and it had arrived with an USB cable, with one USB connector on one side and two on the other. Why do some USB cables have two connectors while others do not?


How do i unfreeze my iPhone 7 when it is stuck on the lock screen? What do I do?

My iPhone screen is completely frozen. I've pressed the power button by itself to turn my phone off but when it cut back on it was still frozen, so I have no way into my phone.


java list.remove work well for first element, but not the others

it was known that can't use list.remove in foreach. there is a confuse for me that phase1 runs ok but phase2 was not. can someone explan this? phase1 List<String> list = new ArrayList<>(); list.add("1"); list.add("2"); for (String item : list) {     if ("1".equals(item)) {         list.remove(item);     } } System.out.println(list);  phase2 List<String> list = new ArrayList<>(); list.add("1"); list.add("2"); for (String item : list) {     if ("2".equals(item)) {         list.remove(item);     } } System.out.println(list);


Are there instances where citing Wikipedia is allowed?

For example, suppose you're writing an article about triangles, and you want to include a short proof of Pythagoras' theorem, but you can't quite remember how to derive it, so you pop over to:  and check the proof there. It works mathematically, makes sense and is as far as you can tell, correct, so you include it. Now the proof on Wikipedia doesn't have a citation because probably someone has been taught it and copied it over to Wikipedia, but it's still correct. The only thing you could cite for the proof would be Wikipedia, would a citation be ok or should it just be copied down without a citation?  Edit: Ok, there have been many responses. Most with a firm "no", but some giving the reason: "Just get the proof from a book" since it's so common, but suppose then it wasn't a common proof of something. Maybe it's not very well known or something but suppose there is a small Wikipedia page with the correct mathematical proof. How much effort are people going to go to to find a proof in a book when there's a (correct (which we know, becuase it's maths and we can check it)) proof on Wikipedia? Why is it so bad to say: "I found this proof on Wikipedia, and the maths checks out so it doesn't matter who wrote it, it is correct, but that's where I found it." Or if you do find it somewhere else why not say: "Proof taken from Wikipedia and verified by the proof shown in "Triangles and their properties, Nature, 2014, p113 etc..."


How to compute $\sum_{x=0}^{\infty}xa^x$?

Need a hint to compute $\displaystyle \sum_{x=0}^\infty xa^x$ and $\displaystyle \sum_{x=0}^\infty x^2a^x$, where $a \in (0,1)$.


What is the difference between 'seemed disappointed' and 'seemed to be disappointed'?

Do they both mean the same thing with former having 'disappointed'  as a noun while the latter, as a verb.Or the latter may refer seeing a person becoming disappointed and the former, a person already in a disappointed state.  There's another statement:     He seemed to becoming disappointed.   But I believe this's incorrect.


Incorrect sort order under "newest recommended" posts

Selecting  show: recommended sort: newest   reveals the following "not-so-newest" sort order:


Ways to obtain new portrait photography clients?

I'd like to increase my portrait business. I've had good experiences with family, pet portraits and High School seniors.  My local newspaper is quite expensive. I've had okay luck with Craigslist, although Craiglist shoppers are far from my ideal client that is willing to pay for quality images, fast turn around and a great experience.  I have a flyer on my community message board, but not enough traffic walks by it. I was thinking about posting at my local churches. I get a few of referrals from friends and family of clients.   What are good ways to reach my local base and increase sales?


Do combining epic/legendary skin shards increase chances of getting better skin shards?

I have several Epic and Legendary skin shards. Do combining them increase my chances of getting a other Epic or Legendary skin shards?


MacBook Pro Function key + Command/Option hotkeys problem

I'm using Intellij Idea on Mac, that heavily utilizes hotkeys including Function keys + the Option and Command keys.  While hardware keys + the Option and Command keys work okay, Touch Bar keys + the Option and Command keys pressed don't register the combination, essentially breaking so many hotkey commands in Idea.  Has anyone been able to resolve this problem?


As a corollary to my other  I was wondering about this:  Once Quorra enters the real world does she become human or is she something else? i.e. Is she a living, breathing, human being with blood, sweat, and tears, is she some kind of human appearing 'alien', or is she a synthetic creation like a robot?


Putting a class inside another list in another class

so basically i want to put the class "GradeBook", which contains 2 arraylists, inside another class "course". I create a setCourse method to link both class together but when I tried to put in the GradeBook inside a list "gradebooks" inside "course" class, there's a NullPointerException. Why can't I put this class i the list.  public class GradeBook {   private List<Double> assignmentScores;  private List<Double> quizScores;  private Course course;   public GradeBook() {     assignmentScores = new ArrayList<>();     quizScores = new ArrayList<>();  }  public void setCourse(Course course) {     this.course = course;  }  public class Course {  private List<GradeBook> gradeBooks;  public void addGradebook(GradeBook gradebook) {     gradebook.setCourse(this);     gradeBooks.add(gradebook); }


Go to line of file where number of lines minus "n"

Say I want to go to the 80th last line of my file celery.log, but I don't know how many lines it has.  The equivalent of the tail command but go to the 80th line from the end instead of the default.  How would I do this?


A question in Subspaces in linear algebra

Looking for some help with the following question. I have begun to understand the concept of subspaces, but not sure how to deal with transverse matrices.  So I need to determine which of the subsets of $M_n(\Bbb R)$ are actually subspaces:  1) $ U = \{A \in M_n\Bbb (R) : A^t = A\}$, 2) $ U = \{A \in M_n\Bbb (R) : A^t = -A\}$, 3) $ U = \{A \in M_n\Bbb (R) : A^t \neq A\}$.


Would proof of Legendre's conjecture also prove Riemann's hypothesis?

is that there exists a prime number between $n^2$ and $(n+1)^2$. This has been shown to be very likely using computers, but this is merely a heuristic. I have read that if this conjecture is true, the biggest gap between two consecutive primes is $O(\sqrt{p})$; the Riemann Hypothesis, on the other hand, implies that this gap is $O(\sqrt{p}\log{p})$, which is a wider gap for sufficiently large inputs. This leaves me asking the following question, which I am aware may be a bit naive, but I want to be sure:  Would a proof of Legendre's conjecture also be considered a proof of ?  EDIT: I am aware that the way the asymptotic above were expressed was in terms of prime numbers, and that the Riemann Hypothesis is concerned about everything in between as well; would a proof of this sort need to show this upper bound for all inputs, or would the prime numbers be sufficient?  EDIT 2: It seems to me that, if a proof of Legendre's conjecture could result in a proof of the Riemann hypothesis, that this would come from the $\log{x}$ term of the asymptotic, showing that this term is never smaller than what results from the distance between primes. In other words, this would have to be an inductive proof, showing an initial case and, as a result of that initial case and the fact that the gap is $O(\sqrt{p})$ for that case, all future cases must therefore be $O(\sqrt{p} \log{p})$. I hate to add to my question once again, but please tell me if this is completely off.


What is difference between built-in "void" and "VOID" from "typedef void VOID"?

Accidentally I have the following issue:  typedef void VOID;  class Cls1 ｛ public:   VOID Clear(VOID); };   And the compiler (g++ 4.6.1) reported     error: 'anonymous' has incomplete type   error: 'invalid use of 'VOID {aka void}'   Is there a particular reason 'void' differ from 'VOID'?


Why did my TeX-related GUI program stop working in Mac OS X Yosemite?

For example, TeX Live Utility 1.17 and earlier will not work on Mac OS X 10.10 Yosemite. If a shell task relies on the PATH environment variable to launch a command, rather than a fully-specified path, it will likely fail. A typical error message will look like this:  /usr/texbin/updmap-sys: line 30: exec: updmap: not found   This can also occur in programs that launch pdflatex, dvipng, epstopdf, or other commands as part of a typesetting process.


What is the significance of the Flash scene in Batman v Superman: Dawn of Justice?  In one scene it looks like Batman was dreaming where Flash comes and says      Bruce! Listen to me right now! It’s Lois! Lois Lane! She’s the key! Am I too soon!? I'm too soon! You were right about him! You were always right about him! Fear him! Fear him and find us. You have to come find us, Bruce!


Extract rows of a table, that include less than x NULLs

I am working with a SQL Server database, which includes a lot of NULLs. To analyse my data, I want to extract all rows of the database table, that include less than x NULL marks (e.g. x=2).  My database is similar to this structure:    c1        c2      c3      c4        c5         ----------------------------------------------------- 2          3       NULL    1         2 2          NULL    NULL    1         2 2          3       NULL    NULL      2 NULL       3       NULL    1         NULL 2          3       NULL    1         2   I tried the query, which doesn't return an error, but no rows are selected:  SELECT * FROM test123  WHERE ((ISNULL(c1,1) + ISNULL(c2,1) + ISNULL(c3,1) + ISNULL(c4,1) + ISNULL(c5,1)) < 2);   I expect this query to return the 1st and the fifth row, but the result contains 0 rows.    I can't test the following code, because I don't have the rights to write on the database, but here is a (pseudo-) code for creating a table like mine:  CREATE TABLE test123(     c1 float,     c2 float,     c3 float,     c4 float,     c5 float ) GO INSERT test123(c1,c2,c3,c4,c5) VALUES (2,3,NULL,1,2),        (2,NULL,NULL,1,2),        (2,3,NULL,NULL,2),        (NULL,3,NULL,1,NULL),        (2,3,NULL,1,2);


Prove: $D_{8n} \not\cong D_{4n} \times Z_2$.

Prove $D_{8n} \not\cong  D_{4n} \times Z_2$.   My trial:  I tried to show that $D_{16}$ is not isomorphic to $D_8 \times Z_2$ by making a contradiction as follows:   Suppose $D_{4n}$ is isomorphic to $D_{2n} \times Z_2$, so $D_{8}$ is isomorphic to $D_{4} \times Z_2$. If $D_{16}$ is isomorphic to $D_{8} \times Z_2 $, then $D_{16}$ is isomorphic to $D_{4} \times Z_2 \times Z_2 $, but there is not Dihedral group of order $4$ so $D_4$ is not a group and so $D_{16}\not\cong D_8\times Z_2$, which gives us a contradiction. Hence, $D_{16}$ is not  isomorphic to $D_{8} \times Z_2$.   I found a counterexample for the statement, so it's not true in general, or at least it's not true in this case.  __  Does this proof make sense or is it mathematically wrong?


A simple question, but one I am unable to find the answer to; What is  $$\sup\{y:x+y\cdot i \in M\}$$ Where $M$ is the Mandelbrot set. How is this constant calculated? Is it a known constant? Etc...


Ask for username and password on 18's login screen

I'm using the latest Ubuntu 18.04 LTS bionic.  When I login it shows my username and I just need to type a password.  I don't want usernames to be shown. I want to be forced to type a username and password.  How do I do that? All I found is info for old versions or lightdm (18 uses gdm).


I am an Indian citizen travelling from London to New Delhi with a 23 hour layover in Helsinki. My Schengen visa expired a few months back. Am I allowed to leave the airport to visit the city or do I need to reapply for a Schengen visa?


Sylvester's determinant identity states that if $A$ and $B$ are matrices of sizes $m\times n$ and $n\times m$, then   $$ \det(I_m+AB) = \det(I_n+BA)$$   where $I_m$ and $I_n$ denote the $m \times m$ and $n \times n$ identity matrices, respectively.  Could you sketch a proof for me, or point to an accessible reference?


If $H$ is a subgroup of $S_n$ and if H is not contained in $A_n$ prove that precisely one half of the elements of H are even permutations. I know that multiplying two odd permutations gives a even, and that one even and one odd return an odd permutation but i have no idea where to go from there.


Abount linear functional: If $T(B)$ is bounded, is $T$ bounded?

Let $H$ be a infinite dimensional Hilbert space and let $B$ be a basis of $H$ that $H=\overline{span(B)}$  moreover, let $T : H \rightarrow K$ be a linear functional   If $T(B)$ is bounded, is $T$ bounded?


Is it preferable to brush one's teeth before or 30-60 minutes after breakfast?  I found plenty of blog posts / testimonials but no actual scientific studies. I'm looking for the latter.    Waiting at least ~30 minutes before toothbrushing has been shown to be useful in a few studies, e.g. :     It is concluded that for protection of dentin surfaces at least 30 min should elapse before toothbrushing after an erosive attack.   Here is an example of some dentist advising to toothbrush before breakfast:  :     Brush and floss your teeth after you eat. This is the most logical answer .You do not want bacteria eating the left-overs in your mouth from breakfast . Remember to floss . Take responsibility for the food that can not be brushed or removed between your teeth.    look very similar but the options they considered were before vs. what after breakfast. They didn't consider comparing before vs. 30 minutes after breakfast. As a result, it isn't a duplicate.   contains some arguments in favor of before and after:   arguments for brushing before:   Bacteria  begin to metabolize sugars into acids almost instantly.  Salivary calcium levels are lowest in the morning putting your teeth are at a much higher risk of acidic damage from bacteria and dietary acids in the morning than at any other time Better to brush with fluoride toothpaste before so you have some fluoride left in your mouth when eating. That fluoride will immediately protect your teeth from the acidous attack of consumed carbohydrates and acidic foodstuff.   arguments for brushing after (waiting >~30 minutes):   gentle brushing can help neutralize the pH in the mouth after a meal. Obviously, if you eat something acidic which will temporarily demineralize your teeth, don't start scrubbing away.


Lightning/Aura Components: component.find().getElement never accessible

What are the actions that might destructively interfere with the lightning app's lifecycle? Is a breakpoint\debugger statement one of such?  For example there is a case that I happen to meet regularly after Winter 17 release (everything below is performed with Locker Service on, switching it off is not an option). Assume we have some component with an init event handler and "select" element:  ... <aura:handler name="init" value="{!this}" action="{!c.doInit}"/> <select aura:id="select-element" class="slds-select" onchange="{!c.handleSelect}"></select>   And here's an "init" handler:  doInit : function(component, event, helper) {     // do smth     debugger; // this can be a debugger statement or manually put browser's breakpoint }   If we happen to have an open console and we catch this breakpoint (immediately resuming it, or not) - in any time later there's no chance to get access to element:  ... component.find("select-element").getElement;   Same happens with div element's, maybe with others.  With absolutely same component's layout and js-controller\helper etc. but with browser's console closed (hence the breakpoint isn't caught) getElement function is there and some code that depends on it will execute successfully.  EDIT: the DOM element is there already (meaning if I use afterRender or some custom button to get a breakpoint far after the init() was executed), I can see it and interact with it - but the getElement function nevertheless is unreachable at that same moment.


Proving convergence Using the definition

Use the definition of convergence to prove if $x_n$ converges to $5$, then  $\frac{x_n+1}{\sqrt{x_n-1}}$ converges to $3$.


Under which circumstance should I use tries instead of binary trees/hash tables?

Does the fact that the keys are usually strings, make it more useful for collections of string data? I know that a hash table uses less space, because it has a chunk of memory allocated to it, rather than for each character of each string.  In terms of search, O(m) is the worst case, where m is the length of a key. Binary tree search is O(log n), so I guess I should compare which is more efficient depending on a situation?  P.S. Before you vote to close, this not an opinion question. I need real facts regarding data structures to make the optimal choice.  Thank you


Is a discrete subgroup of a Hausdorff group closed?

Let $G$ be a Hausdorff topological group. Let $H$ be a subgroup of $G$ such that $H$ is a discrete subspace of $G$.     Is $H$ a closed subgroup of $G$?   I thought this is obviously true, but I failed to prove it.


Is there any disadvantage to buying an oversized filter and using a stepup adapter?

I'm fairly new to photography and I only own two lenses (one with a 52 mm diameter and another with a 58 mm diameter).  I want to buy a good polarizing filter but I don't want to buy one for each lens.  From what I've read online, stepup adapter rings can be used to mate larger filters with smaller lenses.    Since I don't know the diameter of any lenses I might buy in the future, I'm planning on buying a large filter (~77 mm) and then buying adapters for each of my lenses.  Is there any disadvantage to using a stepup adapter with an oversized filter?  Is this a good strategy?


Overlined capital letter with small parenthesis

I would like to produce a particular symbol represented by a capital letter with an uppercase index and an overline bar between small parenthesis. By looking on the web I found  \documentclass{article}  \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage[english]{babel} \usepackage{amsmath,amssymb} \usepackage{mathtools}  \begin{document} \newcommand\brabar{\scalebox{.3}{(}\raisebox{-1.7pt}{$-$}\scalebox{.3}{)}} \[ \overset{\brabar}{D}\phantom{}^{0} \] \end{document}   which produce something close to what I am looking for (not in a very elegant way). I would simply like to have the (-) overset symbol closer to the D capital letter. Is it possible to do that? Thank you very much in advance.


Why isn't pseudo-element content being replaced by more specific declarations?

I've got this <ul> set up with pseudo-element icons before each item. Font Awesome's check mark icon is set as the default for every <li>, but I want to use specific icons for certain items based on their ID (or class. That doesn't seem to work either). But the specific icon content declaration doesn't appear to override the default one, even though the selector should be more specific. Here's a quick example:  .cvt-product-tags li:before {     content: '\f00c'; /* Default checkmark icon */     font-family: 'Font Awesome 5 Pro'; }       /* Custom per-li icons */       .cvt-product-tags li#1394:before {         content: '\f21a'!important; /* Custom boat icon */       }       .cvt-product-tags li#1384:before {         content: '\f207'!important; /* Custom bus icon */     }   I set up a more complete pen over here: .  The confounding thing is that I had something very similar working before some markup changes wherein the content declaration was being properly overridden. What am I doing wrong? Or, more importantly, how do I get it to work right?


Why are there only two charges - positive and negative? Why not more or less?

What happens if theoretically there were more or less charges?


What does closed form solution usually mean?

This is motivated by  and the fact that I have no access to Timothy Chow's paper  indicated there by Qiaochu Yuan.  If an equation $f(x)=0$ has no closed form solution, what does it normally mean? Added: $f$ may depend (and normally does) on parameters.   To me this is equivalent to say that one cannot solve it for $x$ in the sense that there is no elementary expression $g(c_{1},c_{2},\ldots ,c_{p})$ consisting only of a finite number of polynomials, rational functions, roots, exponentials, logarithmic and trigonometric functions, absolute values, integer and fractional parts, such that   $f(g(c_{1},c_{2},\ldots ,c_{p}))=0$.


rewrite rule for case sensitive directory

I'm looking into setting up a re-write to ignore the case of the directory name of the URL.  For example, I have  example.com/TestDirectory   I want to ignore the case so the URL will still direct to   example.com/testdirectory   Here is what I have, but it doesn't seem to be working:  # rewrite rules for example.com/TestDirectory RewriteCond %{http_host} ^example\.com [NC,OR] RewriteCond %{http_host} ^www\.example\.com\TestDirectory [NC] RewriteRule $ http://www.example.ccom/testdirectory/   Am I missing a step?


What does "usage of /" mean on this screen?

I am purchasing a Ubuntu Server machine specified with a 480GB SSD. I am interpreting the said line as the root directory has a 195-ish GB in memory. I am confused!


Grand Admin-Rights on a directory again - win 2012 r2

I have a small... problem atm. that could get bigger if I go further whitout knowing what I'm doing.  So this happened:  I have a Windows Server 2012 R2  It has 2 drives. C: & D:  I wanted to give the usergroup Users more permission to change files in a specific folder.  I recognized the user was in the Administrators group and actually should be able to change files in folder XY. Now after I granted rights to the Users-Group... he suddenly could change files there. All fine untill here.  My thought was:      may the admin-rights has to be refreshed so other users in the admin   group won't run into the same problem   . What I did is:     D: => Right Click => Properties => Security   Selected Administrators => Edit and took away the first checkbox. After exapting this, I dropped my hand on my head and realized that my rights are gone. And now I'm not able to grand them anymore for this folder or directory.  I thoughts where:      may you just change the owner   But since I already have made this mistake I'm afraid to do the next one because inetpub and ftproot is running under D: and I don't know what will happen with the IIS and its rights when I change that.  Any suggestion to solve this ? Or to get the rights back for this folder ?  As information: I was logged in as administrator and took the right from the folder of the adminsitratorsgroup. But I still have access!  EDIT: This is not a duplicate of . I DO have access to the folder! I only want all rights back. Thats some diffrent!!!! Also the posted possible duplicate doesnt even has a really answere! Specialy not suitable with my question.


Divergence of Electric Field Due to a Point Charge

I am trying to formally learn electrodynamics on my own (I only took an introductory course). I have come across the differential form of Gauss's Law.   $$ \nabla \cdot \mathbf E = \frac {\rho}{\epsilon_0}.$$  That's fine and all, but I run into what I believe to be a conceptual misunderstanding when evaluating this for a point charge.   I know the math looks better in spherical coordinates, but I will be using Cartesian.   So when I calculate the divergence I obtain:  $$ \nabla \cdot \mathbf E = \nabla \cdot kQ\langle\frac{x}{(x^2+y^2+z^2)^{\frac{3}{2}}},\frac{y}{(x^2+y^2+z^2)^{\frac{3}{2}}},\frac{z}{(x^2+y^2+z^2)^{\frac{3}{2}}}\rangle = \frac{-3(x^2+y^2+z^2)}{(x^2+y^2+z^2)^{\frac{5}{2}}}+\frac{3}{(x^2+y^2+z^2)^{\frac{3}{2}}}.$$  This can further be simplified:  $$\frac{-3(x^2+y^2+z^2)}{(x^2+y^2+z^2)^{\frac{5}{2}}}+\frac{3}{(x^2+y^2+z^2)^{\frac{3}{2}}} = \frac{3}{(x^2+y^2+z^2)^{\frac{3}{2}}}-\frac{3}{(x^2+y^2+z^2)^{\frac{3}{2}}} = \frac{3-3}{(x^2+y^2+z^2)^{\frac{3}{2}}}.$$   Now instinctively I would say that 3-3 is zero and then the while thing is zero everywhere. I am confused as to why (purely mathematically) this expression is not equal to zero at the origin. I completely understand why it physically has to be that way. And I also understand that it is modeled with the delta dirac function. But what (again, mathematically) is stopping me from saying that equation is just zero even at the origin?


Unfortunately, the Unity Launcher on the left hand side of the screen takes more valuable space away than the new menu bar gives.  Is there any way to get rid of the Launcher?  Alternatives I would be satisfied with include:   Not having the Launcher at all Having the Launcher hide automatically Having applications open on top of the Launcher (not next to it)   (edit:) Note that I am specifically looking for a way to keep the global menubar, while getting rid of the Launcher.


How cost function of Logistic Regression is derived?

How the cost function of logistic regression given below is derived ?  Here Sigmoid function is used for logistic regression. After heavy search on internet i have come up here to put on my question , no other question on this portal talks about it so please don't mark it as duplicate.