Asking feedback/rating for a mobile app?

Fig.1: A typical prompt, asking user for feedback/rating in iOS Background Any serious smartphone users must have seen a message similar to Fig.1 above at least once. Variations of such prompt include: "Please give us 5 star ratings if you love this app!", "Rate us :)", "Your rating helps improve this app!", etc. Basically, Fig.1 asks user to leave a (nice) feedback/rating for the app on its AppStore(or equivalents).  The Shorter Question  When and how often should a mobile app user be asked to leave a feedback/ratings?   The Longer Question #1. Which User-statistics? What are the significant user's behavioral statistics that should be based on to generate Fig.1? For example:  Number of runs since install/reinstall of the application Time elapsed since current application run Time elapsed since first application run Time elapsed since first application install Certain events (e.g. after certain number of stages are cleared for a game app)  #2. When to Ask? If multiple user-statistics are chosen to be calculated to generate Fig.1, specifically how should the user-statistics satisfy the condition of the event? For example:  Form a unified equation (e.g. X^2+Y^2=Z^2) with all significant user-statistics partaken fairly to trigger the event. Create (multiple of) "absolute" event triggers (e.g. every 10th app run; elapsing 2 hours since current application run). Both of the two. Generate Fig.1 whichever comes true first. Neither of the two. "There's a better way!"  #3. How often? What would be the optimal min/max frequency of Fig.1 generation? By optimal, I mean users are not to be bothered too much, yet developers gain maximum output of great feedbacks from users? #4. "Don't bother me again :(" Should users have an option to opt-out from receiving Fig.1 at all? #5. Universal User-statistics for All Mobile Apps? Should apps under different categories be based on different user-statistics? There are significant differences in size and type of user-statistics in apps under different categories. For example, a "Flashlight" app is not typically run for one hour straight, while a music/movie streaming app may be run for over one hour. #6. "This app does not need more feedback." Should every app of all kinds of user base ask this message? If any, should any mobile app stop generating Fig.1 when target conditions are met (e.g. downloads count, active user count, feedback count)? #7. Feedback/Rating Before Deletion Should users be asked to leave a feedback before deleting as seen in Fig.2 below? Users are more likely to leave very critical review on app deletion, but this kind of feedback will be very helpful for the developers to strengthen their app's weakness for next version release.                                                                                Fig.2: Asking user for rating before app deletion


Wat exactly does the notation $$A : (BC)$$ mean? We are talking about fractional R ideals. From definitions i get, if $$a \in A:(BC)$$ then $$a(BC)\subset A$$  But what am i saying exactly?  I hope someone can explain this to me.


New requirements for Americans traveling to Cuba

Hi everyone this is my first time on this site so I apologize in advance for any mistakes in my question.  I am a US citizen who is going to Cuba in January.  Is it true that I can travel under a "general license" without applying for government permission? What verification do I need that my trip meets one of the approved categories, if any?  On the Cuban side, what is the best / cheapest way to get a tourist card? Can I get one at the airport?  (My itinerary is PIT-FLL-HAV on Southwest, if that helps)


How are percents and main author for community-wiki posts computed?

In  which I  recently, I added one hyperlink, added one comma and removed another. From that time, I’ve been reported as the main contributor to the answer, although the changes I made were pretty small.  community wiki 2 revs, 2 users 56% Melebius   I find this devaluing the …  The page  says:     community wiki posts show the editor with the highest percentage of the remaining post in the current version in the author field.   And the  says:     It's not the last editor, it's the most prolific editor, based on a very naive calculation involving lines of the post that were changed.   So I am called “the most prolific editor” because I edited something (although a little bit) in all paragraphs? Are the changed lines interpreted as lines of code, ending with the newline character (paragraphs in fact), and not the lines displayed in browser?  One more thing, the page says 2 users 56%. Where are the remaining 44%? Only two users have been involved in the , so I’d expect their contribution to be 100%.


How can be performed upgrade from 14.04 to 15.10? Is it enough to replace "trusty" as "wily" in sources.list and then run sudo apt-get update && sudo apt-get dist-upgrade?


Suppose I have a noiseless Signal, which has been filtered with a 2nd order Bessel low pass. I know the filter's transfer function. How can I obtain the unfiltered signal? Thanks!


Can I control the fans in a Gigabyte Aero 15?

I wish to know if anybody from here owns too a Gigabyte Aero 15 laptop and if he/she can control the fans. This laptop is from 2017, with a 7th gen. Intel Core i7-7700HQ and an Nvidia GTX 1060 with 6Gb. This is an awesome laptop, thin, compact, lightweight yet at the same time powerfull and a long-lasting battery life. I'm very happy with it, except that I can't control the fans when running Ubuntu, meanwhile this is possible under Windows 10. I want to know if it's possible to control the fans under Ubuntu since it gets pretty hot under some load using this OS. Except that quirk and some others: some Fn keys doesn't work at all, and when connecting an external monitor Grub does not show (I suspect this is a problem between Intel and Nvidia GPUs). I'm pretty happy using Ubuntu but if I could control the fans it would be perfect, the Fn keys problem can be easy to solve with mapping that function keys to another custom keyboard shortcut, and since I only use Ubuntu and Windows 10, it's easy to remember the Grub menu too. So my main issue are the fans. Could anyone guide to know if I can control the fans, please?  Thank you in advance!


Software Updater 14.04 LTS to 16.04.5 LTS upgrade

Will upgrading through Software Updater keep data, file folders, and installed software such as "Audacity?"


five month old newbie who's having some fun, here. I've been experimenting a bit, and got a problem. I was following this tutorial from Zacharias Reinhardt on how to create massive background forests via alpha channels. Seems to me to be the best method there is, if you're aiming for not too much processing.   And then I got stuck in the node editor when removing the black alpha channel part of the png. I'm 99% certain I did everything exactly like Zacharias showed in the tutorial, but somehow, I'm getting a somewhat different result? And yes, RGBA was selected during export of the original file.  I've added a screenshot of the section in the tutorial and a screenshot of what I've got on my screen. Any help would be greatly appreciated! :)


mimic kernel's response to a program that network is not connected?

First let's block all incoming / outgoing traffic.     vi /etc/sysconfig/iptables   *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A OUTPUT -j DROP -A INPUT -j DROP -A FORWARD -j DROP COMMIT   Next: let's test ping  ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.   at that point ping stalls.. perhaps will wait until times out.   Now let's disconnect the network interface and try again:  ping 8.8.8.8 connect: Network is unreachable   beautiful, it stopped instantly. ( no stalling or waiting for time out )  Some recommended using "REJECT" in the iptables-rules and even play with the -j REJECT --reject-with flags..  I have tried them all. there is no way to send the same signal the kernel is sending to the program when the network interface is disconnected. ( via iptables )  This is what I want to do for now:     figure a way to ensure Kernel tells ping that network is   disconnected.    ( or run a command in another terminal manually to send such a signal )   this way ping will not stall. it will simply say  connect: Network is unreachable   and stop.  Can it be done & how ?


Did Obi-Wan ever reach out to Anakin after he became Vader?

In the latest Dark Horse Star Wars comic, Obi-Wan's ghost starts talking to Vader, mostly messing with him, but it occurred to me.   Has any early Expanded Universe material had Obi-Wan reach out to Vader?


Why doesn't the quadratic equation contain $2|a|$ in the denominator?

When deriving the quadratic equation as shown in the  () the main proof contains the step: $$ \left(x+{\frac {b}{2a}}\right)^{2}={\frac {b^{2}-4ac}{4a^{2}}} $$ the square root is taken from both sides, so why is  $$\sqrt{4a^2} = 2a$$  in the denominator and not $$ \sqrt{4a^2} = 2\left |a  \right | $$ Could somebody explain this to me? Thank you very much


In any circular cyclotron, how can the proton projectiles approach each other at more than 50% of the speed of light without exceeding the speed of light relative to each other?


What is the most compact, efficient and reliable way of extracting numbers from dollar amounts in JavaScript?

What I'm talking about is reading a string into a Number, e.g.  "$107,140,946" ---> 107140946  "$9.99" ---> 9.99  Is there a better way than  dolstr.replace('$',''); dolstr.replace(',',''); var num = parseInt(dolstr,10);   ???


When does a matrix of order n have n distinct eigenvectors?

I am researching on matrix diagonalization and trying to understand the condition for matrix diagonalization ( when can a matrix be diagonilized basically... i think it is when there r n distinct eigen vectors for a n order matrix but im not sure when this is the case). Thanks for the help.


In the Marvel universe(s), is Midgard just Earth, or does it include the non-godly space stuff (e.g. Kree, Skrull, Shi'ar, etc.)?

We got here because the people who wrote the Norse legends didn't take space aliens into account, so the Marvel writers had make up god/alien interactions themselves.  There are indications in Thor: The Dark World that the Nine Realms are all in the same universe, so Midgard is just Earth in that case. (We don't know why Yggdrasil makes all those other worlds UN-special.)  Is there any published material for the comic Marvel universe (i.e. 616) whether Midgard is just Earth or the entire dimension Earth is in?  (Yes, I know based on other posts here that it's ambiguous whether the Norse realms are alternate sub-dimensions or planets in the non-Cinematic Marvel Universe.)


Frame break for long proofs and theorems

I have succeeded in fitting my long theorem and its proof on multiple broken frames of the same environment. However I want to shrink my frames for better display.  How can I use   \begin{frame}[allowframebreaks]   together with [shrink]?


I recently stumbled upon an indefinite integral . sin(x)/x [ Another similar one is root (x) times sin x. However if we substitute sin(x) in terms of x as Maclaurin series we could get a series of infinite yet integrable polynomials . What's the catch?


Proof of recursion formula for Stirling number of the second kind

has the identity $$S(n+1, k+1) = \sum_i {n \choose i} S(i, k)\;.$$ I can't seem to find a proof for this and was wondering what it entails. Is it a purely combinatoric argument, or an algebraic manipulation of the explicit formula $S(n, k) = \frac{1}{k!} \sum_{i=0}^k (-1)^i {k \choose i}(k-i)^n $ with the known recurrence formula $S(n+1, k+1) = S(n, k) + (k+1)S(n, k+1)? $


How can I have numbered verbatim environments?

How can I have an automatically numbered verbatim environment, just like equations? I tried putting it like this:  \begin{equation} \begin{verbatim} bla... bla... bla... \end{verbatim} \end{equation}   but it gives me an error. I am sure there must be a better way.


Are there any commands for McPe v.0.15.0

I have been trying to make commands forever but the usual game mode and weather but they never work in any version


Total time taken for an accelerating frame in special relativity

How does one derive the equation for the total time traveled in a constantly accelerating frame? I found some help at this question:  But the information pertains to the measured time at a specific time along the way. I have taken the scenario from the question above, but am asking different questions:    A rocket is constantly accelerating at 1g to reach Andromeda (2.4 x 10^22 m) . Assume travel is in only one direction and no external forces act on the rocket, like gravity. The frames are in standard configuration. Halfway there, it begins to constantly decelerate at 1 g and the change takes no time or energy. Find: - the maximum speed - the total time of the journey measured in the rocket's frame - the total time of the journey measured by someone on Earth  I have tried to do some work on the matter and have derived the following equations so far:  $$   v_i ' = c^2 - \sqrt{\frac{(c^2-v_i^2)}{\gamma^2(1-v_x\frac{v}{c^2})^2}} $$ Where $v_i'$ is the instantaneous velocity as measured by the rocket, $v_i$ is the instantaneous velocity as measured by Earth, and $v_x$ is the velocity of travel along the x-axis as measured from Earth (the rocket travels in a straight line along the x-axis). And I have: $$ \frac{\gamma(v_i')}{\gamma(v_i)}= \gamma(v)\frac{c^2-v_xv}{c^2} $$ Where $\gamma$ is the Lorentz factor as a function. I am completely stuck here however! I do not know how to move forward with deriving the necessary equations to answer the questions above. I assume it has something to do with the rapidity functions, but I am not entirely well-versed in their use. I do have a working knowledge of calculus, which I assume is necessary.


I want to create a method, that:   Takes the type of an enum and a String as arguments   The String is the name of one specific enum instance  Returns the enum instance that fits that name.   What I have tried:  In class TestUtil.java:  public static <E extends Enum<E>> E mapToEnum(Enum<E> mappingEnum, String data) {      return mappingEnum.valueOf(E, data); // Not working, needs Class of Enum and String value }   The enum:  public enum TestEnum {     TEST1("A"),     TEST2("B");      private String value;      private TestEnum(String value) {         this.value = value;     } }   How it should work (For example in main method):  TestEnum x = TestUtil.mapToEnum(TestEnum.class, "TEST1"); // TEST1 is the name of the first enum instance   The problem is, that I can't figure out what I need to pass into the mapToEnum method, so that I can get the valueOf from that Enum.


Setting Environment Variables for Android Studio

I am running cordova, so i wanted to install android-sdk. Here is the path   Android-Studio Path = /home/apps/android-studio Android- /Android/Sdk   Whenever i tried to add via export.. it seems to be included. But i got the error always   ERROR: Error: Failed to find 'ANDROID_HOME' environment variable. Try setting setting it manually. Failed to find 'android' command in your 'PATH'. Try update your 'PATH' to include path to valid SDK directory.   How can i add the environment variables manually.   In the /etc/environment, i tried to add the environment variables manually.   But i got the same got the same error.   Here is what i have in the /opt/environment so far  PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"   What should i add next to make the command work cordova run android


I have a two-column LyX document. I want to add a table that will be as wide as the entire page, so that it will not have to be squeezed into a single column. I found some suggestions:   , however, I have no idea how to implement them in LyX...


Error ! You can't use `\eqno' in math mode

\begin{equation} \label{Latent heat storage}  E = m[{\int_{t_(i)}^{t_(m)} (c_{ps}dt }+\lambda + {\int_{t_(i)}^{t_(m)} (c_{pl})dt] \end{equation}   The above code shows errors, please tell me what's wrong.


How to allow underscore in email regex in coldfusion

hi i am using the regex to validate the email but when i try to user underscore in email address than is giving me the error.  Following is regx which i am using.  ^[a-zA-Z0-9-'+~]+(.[a-zA-Z0-9-'+~]+)*@([a-zA-Z_0-9-]+.)+[a-zA-Z]{2,10}$  if (not isValid("regex", arguments.propertyValue,"^[a-zA-Z0-9-'\+~]+(\.[a-zA-Z0-9-'\+~]+)*@([a-zA-Z_0-9-]+\.)+[a-zA-Z]{2,10}$")) { }   can any one please let me know which regx should i use?


Standard formula for quick calculation of scores

I have three datasets as follows:   Dataset A can have a maximum score of 30. (Individual scores can be from 1 to 30) Dataset B can have a maximum score of 45. (Individual scores can be from 1 to 45) Dataset C can have a maximum score of 25. (Individual scores can be from 1 to 25)   The three datasets contribute equally to a final score, hence it is 33.33% each. i.e. (33.33% for dataset A + 33.33% for dataset B + 33.33% for dataset C) = 100% (final score)  I have the following scores in each dataset:   Dataset A: 22 Dataset B: 15 Dataset C: 10   Is there a quick formula that I can use to work out the final score, based on the above datapoints?   (This is not a homework question.)


So, one of my dwellers just came back from exploration and his happiness is only at 10%. I put him back to full health, reduced his radiation and even made him have sex. But he is still at 10% and I don't know why. I've gotten him working at a place he is good at. And his wife is also working with him but he is still at 10%. What should I do? Should I wait for his happiness to climb up or is it gonna stay at 10%?


Why variable values are lost after terminating the loop in bash?

I have a very simple bash script to compute the sum of numbers appear at each line of a file (I know there are better ways for doing this but I actually need this sum as an auxiliary information and the script is supposed to something more later on). The script is as follows:  TOTAL=0; cat $DATAFILE | while read LINE;  do       COUNT=`echo $LINE| awk '{print $2;}'`;       TOTAL=$((TOTAL+COUNT)); done echo "Total = $TOTAL";   However, I always get the output "Total = 0". Surprisingly enough if I move the last line inside the while loop, I get the correct result. For example if the input file contains  A 5 B 3 C 6   I get the output   Total = 5 Total = 8 Total = 14   But the current version always outputs 0. It seems the value assigned to the variable TOTAL is somehow lost.  Can anyone help me out with the issue?  Thanks in advance


BCM 4313 lost connection on Ubuntu 13.04

hope u can help me.  I have a Dell Inspiron N4030 and using on it the Ubuntu 13.04. This notebook has a BCM 4313 Broadcom wifi chipset, that is causing some headaches to me.  It connects but, after a couple minutes lost the connection with internet. Curiously it doesn't lost the wifi connection, only the internet connection (in other devices the internet keep active).  I've tried countless solutions that I found on the internet and nothing work =/  My kernel: 3.8.0-27-generic  I've tried with firmware-b43-installer and bcmwl-kernel-source and both give me the same problem. Using a USB wireless adapter I can surf normally.


Please see the image? How to write this in latex?


Forum for discussing application concept and application design

In my case I'm designing a rating system and want to discuss the benefit of using a 5-star system vs a binary up/down-vote - and might want to delve into technical aspects such as database representation, algorithms etc. Or I might wish to discuss things such as "gamification" concepts and how to incorporate them into my application, e.g. issues relating to application design. I haven't found any forum for these kinds of questions - is there such a site out there? I ask here because I'm guessing people here are most likely to be aware of such a site if it exist.  Also, it would be nice if such a stack-overflow site related to application design :).


How can I create this pattern in moderncv classic

I am wondering about creating something like this in moderncv.


AI: Make lines "burn" through underlying layer (transparency)

I want to create a SVG icon similar to this:    Instead of drawing the lines, I want to create the shapes formed by the negative space (the white shapes).  What I did was:  Ellipse Tool > drew a circle > Fill: White Ellipse Tool > drew a vertical ellipse and centered it Line Segment Tool > drew 3 horizontal lines   Then I thought to myself "voila!" only to realize I had no idea how to use what I drew on the upper layers to "burn" through and create transparent lines on the bottom layer (which is the white circle). In photoshop I would copy paste and delete the lines to get desired effect as pictured above, but I'm not sure how to proceed in AI.  Question: How can I use upper layer lines / ellipses (or other shapes) to create transparent lines in the bottom layer?


In a visual force page, I can take a date and do this...  <apex:outputText value="{0,date, MMMM d,  yyyy}">     <apex:param value="{!relatedTo.my_date__c}"/> </apex:outputText>   I want to be able to do that in Apex code.  So I want a method which takes a date and returns a certain format as a string.  I check the API:   and sorry if I am stupid but not so obvious how to do this?  Many thanks.


What is the purpose of "~" in the command "sed 's~ ~~g'"?

I found line sed 's~ ~~g' in a shell script on a Linux system. What is this ~?


I was re-watching the Star Wars The Clone Wars Episodes about Darth Maul and Savage Opress and I realized that it was never explained how Maul actually got off of Naboo. I am not asking how he survived that can probably be guessed easily enough seeing as the force can probably be used by the writers to do basically anything they want it to. But I'm wondering how he got out if that huge pit and got off of Naboo. A task like that would be hard enough as is but it must be nearly impossible when he is cut in half. So how did he get off of Naboo and onto that junkyard planet? (Automatic up vote if you add the name of that junkyard planet in the answer)


How should I use quotation marks in sections of multiline dialogue?

If I want to introduce a “pause” between lines of dialogue from the same person by inserting a spacing line, how should I use the quotation marks correctly to indicate continued dialogue? I really don’t want to write it in a gossipy “he said, she said” way!  I have noticed that closing quotations aren’t always placed on the end of a line.  What are the rules?


What environment variables/shell variables do env and printenv show

I have seen related questions such as  but they don't provide the exact answer to my question  From my experiments as well as , printenv and env pretty much show the same set of system variables.  If I set the variables in   /etc/bash.bashrc (supposed to be for system-wide system variables)  SYSTEM_ENVI=1000  ~/.bashrc (supposed to be for user-specific system variables)  USER_ENVI=10    I even logged out and logged in so the /etc/environment takes effect. The following scenario takes place:  $echo $SYSTEM_ENVI //outputs 1000 $echo $USER_ENVI //outputs 10 $CURR_ENVI=1 $env | grep USER_ENVI //nothing shows up, the same if I grepped SYSTEM_ENVI or CURR_ENVI $set | grep USER_ENVI //shows up USER_ENVI assignment, the same if I grepped SYSTEM_ENVI or CURR_ENVI   My questions are:   What system variables do printenv/env print? Should one use set to see all accessible variable (system variable and local variable) instead of printenv or env?   Regarding not duplication justification  As far as I am concern, this question and the marked answer helped me realize the facts that:   Shell variables are not environment variables Assignments in /etc/bash.bashrc or ~/.bashrc don't create environment variables but rather instruct the interactive non-login-shell processes to create and initialize these shell variables on startups.   I think my question is not necessarily different from  but reading the marked answer on that one doesn't satisfy me as much as the answer given in this post.


Do spells from the Ritual Caster feat need to be prepared when taken by a Warlock?

Say I have a Warlock that takes the Ritual Caster feat. Do the spells learned from the feat have to be prepared by the Warlock before being cast as a ritual or do they always have the spells available to cast as a ritual?  My confusion stems from the fact that most of the mechanics from the Ritual Caster feat seems to mirror the way a Wizard casts spells. Wizards are the only class that are specifically allowed to cast spells as a ritual without preparation by default. However, nothing in the feat actually describes that it works the same as Wizard ritual casting or different from it.


many masters in here. I just have some problem while installing software via terminal. for example, I want to install wine with the code sudo apt-get install wine. But terminal said this:   Reading package lists... Done Building dependency tree        Reading state information... Done You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies:  shotwell : Depends: shotwell-common (= 0.18.0-0ubuntu4) but 0.18.0-0ubuntu4.2 is to be installed  wine : Depends: wine1.6 but it is not going to be installed or                  wine1.7 but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).   anyone wants to help me ? great thanks for all of you masters.


Are Constitution changes retroactive when calculating max HP?

Lets say I'm a fighter that just leveled up to level 4, and decide to bring my Constitution up from 16 to 18. How many hit points do I have?  Level 1 = 10 (base) + 3 (Con mod) = 13.  Level 2 = 10 + 6 (average HP per fighter level) + 3 (Con mod) x 2 = 22  Level 3 = 10 + 6 (average) x 2 + 3 (Con mod) x 3 = 31  Level 4 = 10 + 6 (avg) x 3 + 3 (Con mod) x 3 (3 level-ups) + 4 (increased Con mod, which is now 4) x 1 = 41?  OR  Level 4 = 10 + 6 (avg) x 3 + 4 x 4 (4 times current Con mod) = 44?  If it's the first option, it's simply better to level Constitution up at earlier levels.


Statistics about flights arriving behind schedule?

I am planning a trip and it is important to me to arrive on time, so I want to calculate how much hours behind schedule can the plane arrive. For example, if I want to be at the destination airport at 12:00, and I take a flight that is supposed to arrive at 11:00, what are the chances that the flight actually arrives after 12:00?  This probably depends on the origin, destination, airplane, etc., so I am looking for statistical data tables. Where can I find such tables?


Redirect 301 issue with URLs containing question marks

I'm trying to do some basic point to point redirects using 301 redirect 301 with a .htaccess.  All is going well but there is one type of URL that is not happy.  I'm trying to go from:  http://www.greenshorticulture.co.uk/details.asp?productid=802&subcat=189&cat=182  To:  https://greenshydro.co.uk/hydroponics  I'm using:  Redirect 301 /details.asp?productid=802&subcat=189&cat=182   https://greenshydro.co.uk/hydroponics   But when I run the check on it I end up with:  https://greenshydro.co.ukdetails.asp/?productid=647&subcat=347&cat=198  Other redirects without the question mark in them are working fine, just this type is failing.  The pages that I am trying to redirect to are old product pages - I need to do individual links to avoid soft 404's.


Don't show a running application in the launcher (PyQt4)

I write an application that has an icon in the upper right corner in the notification area, so there is no need to put its icon in the launcher.  But it is automatically put there. How do I disable that (in code, not X)? I write this in python with Qt, PyQt4.


InDesign: "page bleed" with pictures spanning on two pages

lately I had a problem that I neved faced before now, I'll try to explain quickly: usually I setup documents in InDesign CS6 with side-by-side pages and work with pictures that run over two (side-by-side) pages, then I export to PDF.  The problem is that a printing service asked me to export to PDF only in single pages with page bleed on each size and each page, but of course in the "middle side" of the two pages, there is no bleed (on the left page there is no bleed on the right side, and on the right page there is no bleed on the left side).  Is there a way to achieve that result, or I have to work since the beginning with single pages? For example, if I want one big image on two side-by-side page, should I import two times the same image and position it cutting it properly (half image each page)? Isn't it very uncomfortable?  I tried many things but couldn't find any solution.    Thanks a lot for your answer that are great, but I'm adding some details to explain myself better (sorry but english is not my mother language and also my InDesign is in Italian).  The method explained works fantastic with the images if you add them into the pages, but if you have something in the "master" pages, they will overlap on the pages, I did an example to explain better.  This one is with a banner on the master page right and left, with different colors.    You can see that a yellow part of the title background overlap the right page, and vice-versa. How do you manage this problem?


Finding $\lim_{(x,y) \rightarrow (0,0)} \frac{\cos(xy) -1}{x^2 y^2}$

I need to find the following limit:   $$\lim_{(x,y) \rightarrow (0,0)} \frac{\cos(xy) -1}{x^2 y^2}$$  I did the following:  Let $f(x) = \dfrac{\cos(x)-1}{x^2}$ and $g(x,y) = xy$. Then we would have $$\lim_{(x,y) \rightarrow (0,0)} \frac{\cos(xy) -1}{x^2 y^2} =  \frac{\cos(\lim_{(x,y) \rightarrow (0,0)} xy) -1}{(\lim_{(x,y) \rightarrow (0,0)} xy)^2}=0$$  Is my procedure correct? What are other approaches one could have with these limits? Thanks.


Nikon D5100 “Press Shutter Release Button Again” error, but fixing itself after left alone for a while

First of all to be clear, the camera was not dropped or anything; it started to behave like this from nothing.  I turned on my camera and first it displayed "Turn off the camera and turn on again". After that, it constantly showed the "Press shutter release button again". Normally I first searched Google for the problem, and all the threads I could find was shutter mechanism needs to be lubricated, or the mirror was jammed etc. All these were due to dropping the camera.   I took the camera to Nikon, and they asked ~250 EUR to fix it. Since I don't have the money right now, I got it back home and turned it on - tada! Camera is working again. I took about 50 pictures when it showed the error again. This started to happen every time: I leave it for couple of hours, turn it on, and take ~50 photos before the error shows again.  I check the mirror, shutter blades and everything, but nothing looks stuck or jammed to me. I'm really puzzled by the "cooldown" time it needs to be working again. If the shutter / mirror / blades / whatever is jammed, it won't work at all.  Does anyone else had this problem? How did you resolve it?


As far as i know it is not possible to do the following in C# 2.0  public class Father {     public virtual Father SomePropertyName     {         get         {             return this;         }     } }  public class Child : Father {     public override Child SomePropertyName     {         get         {             return this;         }     } }   I workaround the problem by creating the property in the derived class as "new", but of course that is not polymorphic.  public new Child SomePropertyName   Is there any solution in 2.0? What about any features in 3.5 that address this matter?


How can I create text with a drop shadow combined with a stroke in Photoshop?

I want to achieve this text effect. The references below seems a mix of stroke and a box shadow. But the shadow seems connected to text (normal text shadow is like basically another text layer just below it, displaced slightly). There are answers here for how to do this in Illustrator and Photoshop but the drop shadows are not combined with strokes. I am not sure how to do it in Photoshop.   Kindly note that I don't mean this kind of effect. It's just separated drop shadow.


I prefer using attributes like lang, dir, id, class and others to store useful data for some javascript functions that reference these objects - I do this to avoid using an array that may have to be updated after every action or change. The problem is that this is a bad practice and I cannot always use the attributes I want, because they're already in use or not available on some tag types. Is there a better way?  Note that I dont like using multiple values split with a separator as this is slow when dealing with massive amounts of objects.


Does $L = I \omega$ apply for an axis not passing through the rigid body?

I have seen in Kleppner & Kolenkow that for a rigid body moving with a fixed point on it, the angular momentum about an axis passing through that fixed point is given by the product of inertia tensor and angular velocity. Does that apply for an axis not passing through the rigid body too?


How do you get this style of breading? I'm referring to this kind:   I'm doing Flour > egg > flour. but I dont get the results I want. I also don't want to use breadcrumbs for this. Can anyone suggest something?


Does Windows 8 not support path longer than a certian length such as 256 characters? Such path is created under Linux, because Linux doesn't have such limitation. Thanks!


What is the difference between a 'pram', a 'pushchair', and a 'buggy'?  According to Google:         pram: a four-wheeled carriage for a baby, pushed by a person on foot   pushchair: a folding chair on wheels, in which a baby or young child can be pushed along   buggy: a light pushchair with a soft seat that allows the chair to be collapsed inwards      It appears from the above definitions that a pram has four wheels (so those with three wheels should not be called prams?), while a buggy is a light pushchair (how light?).  I tend to think that a pushchair is the light one with four small wheels, while a pram is the heavier one with bigger wheels. But if a buggy is a 'light pushchair', how could it be that I have heard people calling what I think is a pram, a buggy.  Or can all these terms actually be used interchangeably?


\documentclass{barticle} \title{EkiT pRbn/dh} \author{Ajana elkhk} \date{pNNicesh {oi}bshakh, 1413} \begin{document} \bng \maketitle \section{pRthm pirec/chd} rbiin/dRnaethr EkiT kibtar shuru inec ed{O}ya Hl. \begin{verse} kt Ajanaer jana{I}el tuim \\ kt gher idel ThNNa{I}. \\ duurek kirel inkT bn/dhu,\\ prek kirel bha{I}....  \end{verse} \end{document}


Tilling chessboard by L shaped tiles, to cover all white cells

Consider an  N x N chessboard whose top-left corner is colored white. And we have to cover all white cells. The only tool we have are black L-shaped tiles each of which covers 3 unit cells. Formally, each tile covers 3 unit cells satisfying the following:  Two of the cells are adjacent to the third (shares a side). All three of the cells do not lie on the same row or same column.  No two tiles should overlap (cover the same cell) or go outside the board. We have to cover all the white cells using the minimum number of tiles. One example for N = 4 is,  The problem is to find the minimum number of tiles required as the value of N increases. Is there a generic formulation or we need to iteratively identify the best possible solution manually. Thank you.


Is Redundant Programming in Java Inefficient?

For example I have 3 calls of one method (always 3 calls) and I need to pass 1 to method for the first call 2 for the second and 3 for the third. I can solve that Problem in 2 ways. Either make 3 calls with 1, 2, 3 or use a for loop.  call(1); call(2); call(3);  for (int i = 1; i <= 3; i++) {     call(i); }   The question is what will run faster. As I know this depends completly on the Java Compiler, because it could make optimizations on the for loop.  In plain C the redundant way would be a little bit faster I guess, because there is no counter needed to increment and compare.


When should I have an NPC actively investigate an illusion created by the Phantasmal Force spell?

The phantasmal force spell can be broken if the victim examines the illusion and makes a successful investigation check against the spell's DC.  What general guidelines should I use to decide when the victim of phantasmal force should use its action to examine the illusion?  Suppose the caster makes an orc think it is being attacked by a wolf.  Should the orc always examine the wolf until the spell ends? Or should the orc use its action to attack the wolf, defend itself, or run away?


return a local pointer which points to a static variable

Here is the code,  char *foo() {     static char s[10] = "abcde";     return s; }  char *bar() {     char *c = foo();     return c; }  int main() {     printf("%s\n", bar());  }   Typically, it is wrong to return a local pointer as I did in bar, but now c points to a static var returned by foo, would it be correct to return a local var c in bar?  I tried, it printf the right value, but I don't understand how it works. I thought, when bar() finishes, the var c should vanish, which should make printf print undefined stuff, right?  Follow Up  char *c is a local var, if char *c = "abcde";, I assume this: c is a local var which resides in the function's stack, while "abcde" is a constant var which resides in the constants-area (part of the heap?), so when bar() finishes, c vanishes, but "abcde" still remains in the heap, right?


Can you increase the amount of time in a day?  Minecraft has the same amount of time each day, but what if you want to have longer days and shorter nights so zombies wont have as much time to kill you.  Is there a command out there so I can extend the time of day in vanilla Minecraft for my world?


Why do some users have username "user########"?

Maybe I'm just missing something obvious, but what's up with this syntax? Is it because people sign up with e-mail addresses and use those for logging in, but don't bother giving themselves custom names (or completing their profile in any way)?


Find the inverse element of a group $(G,\circ),$ $x\circ y=x*a*y$

Let $(G,*,{}^{-1},e)$ be a group and $a\in G$ fixed element. We define a new operation $\circ$ on $G:$ $$x\circ y=x*a*y.$$  I have to show that $(G,\circ)$ is, also, a group. I don't know how to find inverse element of a element $x.$ I get that neutral in this structure is fixed element $a.$ Then  $$x\circ x^{-1}=a$$ and $x*a*x^{-1}=a.$ What to do next?


Why gpedit and the corresponding registry entries are not synchronized?

I'm on Windows 10 Pro. I noticed that when I apply some policies via gpedit, the corresponding entries are created in the registry. If I undo, the entries are removed from the registry as well.  So I expected it to work the other way around too, but if I manually set the same policy via registry, the corresponding gpedit entries still show as "not configured".  Am I missing something? is the gpedit policy something more than a registry entry? so... where are they stored?


Execute SQL Query with VBA and fill sheet with data

Very new to any form of code. Attempting to run a script in VBA that will pull data from an access database using SQL and put it into an excel spreadsheet. Code is similar to below. Runs clean but I don't know how to use the data it is pulling. Thanks in advance.   Sub Get_Data() Dim cn As Object Dim rs As Object Dim strFile As String Dim strCon As String Dim strSQL, strInput As String  strFile = "S:\Location.Database.accdb"  strCon = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source=" & strFile  Set cn = CreateObject("ADODB.Connection") cn.Open strCon  strInput = InputBox("Input Desired Name")  strSQL = "SELECT NAME, Location WHERE NAME =""'strInput'"";"  cn.Execute strSQL  cn.Close Set cn = Nothing  End Sub


How to query a property that is not part of the model in NHibernate?

I have a User entity that contains the username, name and other non sensitive information.  During authentication, I need to query the password (hashed) and the password salt in order to do a hash comparison. Those two properties are not part of the model due to their sensitive nature.  How can I query those two properties in NHibernate without using CreateSQLQuery? I now that CreateSQLQuery works, but I was trying to find a non SQL way.


Copyright Concerns... Similar Logo - Different Industries

I've been working on a logo for a local church and I finally created something their board agreed upon. But, when they asked me to do a copyright check I found ONE similar logo in particular that has a copyright that has me concerned. My design:   I made my design from scratch and it has an overall similar feel, but a different crop and flame to a copyrighted logo design for a potential grain fumigation company. Meaning that this logo copyright is owned solely by a designer and not a commercial grain fumigation company. The other logo:    Should I be concerned even though there are differences and they are in two COMPLETELY different industries (NPO Church and Agricultural)?


Are the rules really so important that a useful question has to be deleted?

I needed to find a good Perl module to do HTML parsing.  The good thing about Perl is the CPAN (module library) with gazillions of modules to do everything, the bad thing is that it's hard to find the right module.  So I though, let's ask Stack Overflow: “What is a good Modern Perl way to parse HTML documents?”  I quickly got one great answer and several good comments.  I would have gotten at least one more good answer, but then the question was put on hold because it's “subjective”, and it couldn't be added anymore.  In spite of protests, it was then closed and later deleted.  I've got the answers that I needed, but now other people will be deprived of this useful information.  Is it really so important to stick to the rules that this question had to be removed? Yes, it's subjective.  By definition.  I want people's opinions about what module I should use, after all. The question got 8 plus-votes and 2 minus-votes, so others thought it was useful too.  The URL was  , but I think it only works when logged in as me.  Do I need to start looking for another site to ask such questions?  If so, too bad, I really liked Stack Overflow until now.


Should I write "considered" or "considered as" in the following example?

Example:     He was very plain. He could be considered (as) the standard of the average.   Do I need the "as" in the following sentence? Why or why not?


Why is $p\Rightarrow q$ equivalent to $\neg p\lor q$ and how to prove it

I don't know how to prove that $p\Rightarrow q$ is equivalent to $\neg p\lor q$ ,here is the link  . And I don't know how wolframalpha generate "Minimal forms" .   Can you prove $p\Rightarrow q \equiv \neg p\lor q$,  and explain how to get "Minimal forms" ?  Thanks!


Why would you not want to rollover a previous employer's 401(k) when changing jobs?

Are there any valid reasons to not rollover a former 401(k) when changing jobs?  I have several little ones that I never quite got around to rolling together - with an upcoming job change, should they all be combined into my new employer's retirement plan?  If not, what else might be considered?


sed to operate on a range of lines plus a single line

Let's say I have a file file.txt: hello  world hi there this wow  I know sed can operate on one line like: sed -n '2p' file.txt or a range : sed -n '2,4p' file.txt but how to operate on one specific line plus a range ? sed -n '1line and 4,5' file.txt or in words print the first line and the range from 4th to 5th line ??


Proper way to use json_encoded form data to create dynamic insert statements

I have several tables with many columns that will be populated from form data the user inputs in PHP.  Instead of having to put each column name and value individually, INSERT INTOusers(email,password) VALUES ('$email','$password') is there a way to correctly do this using the json encoded data so with the more complex tables so I don't need to do:  INSERT INTO `profile`(`user_id`, `fName`, `lName`, `address1`,                      `address2`, `city`, `state`, `zip`, `phone`,                      `country`, `dob`, `homeBase`, `active`)              VALUES ('$user[id]','$fName', '$lName', '$address1',                      '$address2', '$city', '$state', '$zip', '$phone',                      '$country', '$dob', '$homeBase', 'active')`    where all the info comes from:    $email = mysqli_real_escape_string($con, trim($request->data->email));   $password = mysqli_real_escape_string($con, trim($request->data->password));   $fName = mysqli_real_escape_string($con, trim($request->data->fName));   $lName = mysqli_real_escape_string($con, trim($request->data->lName));   $address1 = mysqli_real_escape_string($con, trim($request->data->address1));   $address2 = mysqli_real_escape_string($con, trim($request->data->address2));   $city = mysqli_real_escape_string($con, trim($request->data->city));   $state = mysqli_real_escape_string($con, trim($request->data->state));   $zip = mysqli_real_escape_string($con, trim($request->data->zip));   $phone = mysqli_real_escape_string($con, trim($request->data->phone));   $country = mysqli_real_escape_string($con, trim($request->data->country));   $dob = mysqli_real_escape_string($con, trim($request->data->dob));   $homeBase = mysqli_real_escape_string($con, trim($request->data->homeBase));   I am using Angular and Ionic to create the form and get the data, if that makes a difference to anyone.  Everything works as is, just looking for a better way as the tables and forms grow.  Thanks in advance.


Javascript: can't view an html file with javascript reference

I am trying to follow  great tutorial of frontend programming. I've come along building all the required files (until chapter 8), hopefully understanding most of the theory.  My problem is that when I try to open index.html in my IE11 I cannot see the page at all.  Only when I comment the following line inside the  of index.html:  <script src="src/model/Book.js"/>   then I can see the html visually.  Active Scripting on my IE is enabled. Maybe it can be that my AVG Internet security is involved? I disabled its "Web Shield" feature - but no help.  Can you advise please?  Thanks!


Calculate turn rate between xy and target xy on a moving sprite with variable speed

My First question on here so be kind...  I am writing an aerodrome simulator in as2, I need to calculate a turn rate between 2 points so that the aircraft turns nicely. I have tried a few things but the maths forums on this type of subject use complex calculations and I struggle to understand them. I need an answer in a more variable specific format.  I have the XY of both tile and target, the speed of tile and the distance of target from the tile.    I use vector math, with frame time calculations to move the tile. I already have a good calculation for shortest turn i.e. left right.  I need to calculate the turn rate required to go from point a to point b in a nice fluid motion and turn the tile/aircraft in a nice fashion.  Any help would be much appreciated.


tail display whole file and then only changes

My Linux version is 2.6.32-47-server (gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1) ) #109-Ubuntu SMP Tue May 7 02:17:05 UTC 2013  I am currently doing a tail -f file  and life is good. But that only shows the last X lines. Is it possible for tail to first display the whole file and then behave like tail -f?  I tried tail -500 -f file but that gave me tail: option used in invalid context -- 1 In a sense, it would be like cat file; tail -f file; But showing only the lines that were not displayed since the cat  Is it possible?


How do I add time to a date in unix shell script?

I have a file that contains date values. I want to be able to pull the last line of the file, formatted like "'2018-09-18 16:42:57'" add 1 day to it and store that into a variable. The code I have right now looks like the following, but it does not work:  start_date=$(tail -n 1 run_dates.txt) start_date=$(start_date -d "+1 day")   What is the correct syntax to do this?


Why am I constantly running out of space on my Galaxy S2?

I have a Galaxy S2 running Android 4.1.2. It has a 12GB internal HD, and a 16GB SD card.  I keep getting errors from various programs telling me I am running out of space. BeyondPod won't download new episodes, Evernote keeps putting up a notification of a lack of space (even though it seems to be storing everything), and sometimes apps won't update.  I have tried to ensure I have no superfluous apps, and I haven't really changed the apps I use since I first ever started using the device. I keep any large files, like music collections or videos, on my SD card.  When I connect my device by USB to my Linux computer and check the properties of my 12GB HD, it says 9.9 GB is used. But if I browse the files, every folder seems to have barely kilobytes of information.   Why is my 12GB HD filling up, and how do I clear it out so I don't get these errors?  Update: My phone is rooted, so if that is something that can help me in this situaton, then root access is available to me.


Ubuntu 13.04 on Mac Mini 6,2 ethernet port Broadcom NetXtreme BCM57766 not detected

The said network adapter is not recognized in 13.04. In 12.04 and 12.10 I had used the driver proposed from broadcom download site, configured as dkms package it was always updated.  On the 3.8.x kernels this provided kernel driver from broadcom does not compile anymore - and the distribution provided tg3 drivers does not recognize the ethernet adapter - even though it is a newer version.  ~$ modinfo /lib/modules/3.8.0-19 generic/kernel/drivers/net/ethernet/broadcom/tg3.ko | grep -i version version:        3.128 srcversion:     D737202366709FE01964BF0 vermagic:       3.8.0-19-generic SMP mod_unload modversions    Here the working version on kernel 3.5.x using dkms  ~$ modinfo /lib/modules/3.5.0-25-generic/updates/dkms/tg3.ko | grep version version:        3.124c srcversion:     D01ED9A7BF2C3956E212A63 vermagic:       3.5.0-25-generic SMP mod_unload modversions    The Network card:  ~$ lspci -nn | grep 0200 01:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme BCM57766 Gigabit Ethernet PCIe [14e4:1686] (rev 01)   As found on the i7 Mac Mini 6,2.  Anyone knows where I can get a kernel that recognizes that ethernet device ? That chip is supported somehow ... And - the 3.8.x kernel is way better on the HD4000 chip - reason I use it.  Note - to get the WiFi working, just make sure you load the b43 driver at boot (/etc/modules). At least then you have Network connectivity.


(exercise from Tao's analysis book) Proof of a lemma relating to power set of X

I'm stuck at one exercise from chapter of sets from Terence Tao's analysis book. I need to proof the lemma:  Lemma: Let $X$ be a set. Then the set $\{Y : Y \:\text{is a subset of}\: X\}$ is a set.  Note: The set $\{Y : Y \:\text{is a subset of}\: X\}$ is known as the power set of $X$, defined as  $2^X $  I can understand why the lemma is true, but I have no clue how to prove it. Furthermore, the author gave a hint that I found very confusing, it follows:  Hint: start with the set $\{0, 1\}^X$ and apply the replacement axiom, replacing each function $f$ with the object $f^{-1}(\{1\})$.


I need to add SSL to a Apache/Linux sever.  Do I have to generate CSR from the same server which I need to add SSL?   Also when I add SSL in Apache sever, can I omit mentioning key file like below?  <VirtualHost *:443>     ServerName www.example.com     SSLEngine on     SSLCertificateFile /path/to/www.example.com.cert     SSLCertificateChainFile /path/to/DigiCertCA.crt </VirtualHost>


How can I enter a app, that has to be updated, purchased in a different apple ID without having to delete it?

So, I have this music app that I want to enter, but I can't since it needs to be updated and is in another ID, but the musics that I have in the app can not be loaded somewhere else without entering the app, I searched on how to update a app that was purchased in a different ID, but I would have to delete it and lose all the music in it, is there anyway that I can enter the app without updating it or another way to update it without having to delete it?


USB iso burnt using Rufus boots into a message "Unable to find a medium container a live file system"

I followed  to the letter, except I was burning Ubuntu v20 and not v18. When I boot from this USB on a laptop, I receive a full screen of repeated errors: /init: line 49: can't open /dev/sr0: No Medium Found  Followed by a single: Unable to find a medium container a live file system Attempt interactive netboot from a URL? yes no (default yes):  Help appreciated.


In the question , a very nice solution was given for typesetting a column vector with an arbitrary number of rows. I am attempting to modify the code to produce row vectors instead of column vectors. I made the "obvious" change, i.e., substituting the & for the \\ as indicated by the snippet below:  \newcount\colveccount \newcommand*\colvec[1]{         \global\colveccount#1         \begin{pmatrix}         \colvecnext } \def\colvecnext#1{         #1         \global\advance\colveccount-1         \ifnum\colveccount>0                 &                 \expandafter\colvecnext         \else                 \end{pmatrix}         \fi } My modification however fails to compile and the errors, of course, are not very helpful. So my question is, How can I modify the \colvec and \colvecnext macros to produce row vectors?


No Nontrivial Homomorphism from $\Bbb{Q}$ to $S_3$?

I am working through an example in Hungerford. In this example, he asserts that it's not difficult to show that the only homomorphism from $\Bbb{Q}$, regarded as an additive group, to $S_3$ is the trivial homomorphism. I am having trouble seeing this. Treat $\Bbb{Q}$ as an additive group, and let $G$ be some group (written multiplicatively). If $f : \Bbb{Q} \to G$ a homomorphism, I believe that $f(p/q) = f(1)^{-pq}$, so that the homomorphism is determined by how it maps $1$ (at least is what I proved on my own; it may be wrong). In our case $G = S_3$. If $f(1)= e$, then $f$ is the trivial homomorphism. If $f(1) \neq e$, then...  Not sure what to do at this point. I could use a hint.


I am experiencing a conversion Issue with (int) type casting from float values. Please see the following PHP 7.4 examples: $amount = 2.53; $amount = $amount * 100; var_dump((int) $amount);  This code returns the following output on PHP7.4. int(252)  While the following example returns correctly: $amount = 12.53; $amount = $amount * 100; var_dump((int) $amount);  Returns int(1253)  To be honest I am a bit lost on this problem and what is causing this. If someone would be able to explain what is happening here it would be nice.


What is appliance and how to use lambda expressions?

I've read that Lambda Expressions are an incredibly powerful addition to C#, yet I find myself mystified by them. How can they improve my life or make my code better? Can anyone point to a good resource for learning such expressions?  They seem cool as hell, but how do they relate to my day-to-day life as an asp.net developer?  Edit: Thanks for the examples, and thanks for the link to Eric White's articles. I'm still digesting those now. One quick question: are lambda expressions useful for anything other than querying? Every example I've seen has been a query construct.


1 An n-dimensional generalisation OR 2 A n-dimensional generalisation. I would like to say the first is correct but my friend insists the second. Which is the correct way?


Python how to import and use a class from a different file

I don't quite understand the usage of classes and import. I have two files as follows: file test1.py contains the following: class myClass:     def __init__(self):         pass # do nothing     def update(self):         print("test1")         return  # test this module m = myClass() m.update()   file test2.py contains the following: from test1 import myClass m = myClass() m.update()   when I run the module test2.py, it prints the following two lines of text: test1 test1   Why does it print "test1" two times?  I only want to use the class myClass.  I don't want test2.py to execute the test program that is in test1.py.


Null Pointer Exception - but just in one classs

I have two classes. I am trying to access a companion var of a Kotlin file. private XClass xclass = Xclass.xclass;  This works just fine in one of my classes, but on my other class, all it does is produce a Null Pointer Exception when trying to access this variable. Said class implements another class, and thus has a lot of @Override functions. What could be the reason for the Null Pointer Exception?


What actually is a determinant? How it have such properties and what does it tell about?

I have completed by Matrices classes and the only question that is roaming in my mind is what is this determinant actually. Like they simply told the formula and things that are to be calculated and how to calculate them.  I wanna know what these determinants actually tell about a matrix and how do they relate to them? Like we have a matrix and its determinant, how is this determinant related to it? And why do we calculate the determinant in the way we calculate it?   Like already matrix multiplication is a bit different then I expected it to be. One more thing I wanna know is why the determinant has such properties and how does it exhibit them? And how can these things be related to each other? Thanks!


Would Gravitational Time Dilation still apply between two gravitational sources?

As explained on , when an object is experiencing strong gravitational forces, time passes slower for it. If, in theory, you had two objects exerting the same amount of gravitational pressure on an object in opposite directions, effectively cancelling each other out, would they cancel out the time dilation, or would they compound, making the time dilation more prevalant?


Show that for $u,v \in \mathbb{C}$ with $|u|<1, |v|<1$, and $\bar{u}v\neq u\bar{v}$, we always have $$\left|\left(1+|u|^2\right)v-\left(1+|v|^2\right)u\right|>\left|u\bar{v}-\bar{u}v\right|.$$


Moment of inertia and centre of masses of continuous bodies

I'm quite accustomed with integration and all those calculus involved in finding moment of inertia as well as center of mass. But a random thought is wiggling in my mind. Why do we take $dm$ instead of $dr$ in finding moment of inertia and center of masses of continuous bodies?


Copy question or answer source text when "Suggested edit queue is full"

For users below 2k reputation who need to copy a question or answer source text, the only option nowadays is to use the "edit" button and copy the source from the edit page. When the "Suggested edit queue is full", this is not possible.  Is there another way to copy the source text of a question or answer? What about comments? Would it be useful to add a "view source" button to questions and answers? What about comments?


I am doing an IV regression after OLS. From OLS I get significant results but I want to control for endogeneity and check reverse causality. So when I do IV, the sign of my main explanatory variable changes. That I can explain in theory. But my result is insignificant. Any reason why the significance changes when going from OLS to IV and any ways to handle the problem?


I know that we can have a $U(1)$ bundle over the base manifold like $S^2$. For example, we can choose the fibre $U(1)=S^1$ over $S^2$ as the $S^3$ Hopf fibration. Now, can we have any nontrivial $U(1)$ bundles over a flat Euclidean $\mathbb{R}^d$ or Minkowski $\mathbb{R}^{d,1}$ space? If so, could you give some examples? If not, could you give me a proof? (or at least sketch your arguments to convince me?)


First Order Time-Variant System : Picard Method

I looking at a time variant first order system. I am trying to prove that a sequence of functions $x^{[k]}(t)$ generated using Picard iterations converges uniformly on some interval $[0,T]$.  Given:  $\dot{x}(t)=A(t)x(t)$ where $x(0)=x_0$  $x(t)=x∈R^n$ where $A(t)$ is a $n×n$ matrix  Assume there exists $M$ such that $||A(t)||\le M$ for all $t\ge 0$ and that $A(t)$ is a piecewise continuous function. Show that, for any $T > 0$, a solution exists in the interval $[0,T]$.  I know that $x(t)=x_0+\int^t_0A(τ)x(τ) dτ$ must be satisfied if the solution does indeed exist.  I am supposed to use Picard iterations to prove this, which I am not familiar with yet. But I know that they are of the form: $x^{[k+1]}=x_0+\int^t_0A(τ)x^{[k]}(τ) dτ$. Where $x^{[0]}(t)=x_0$  Can I use the standard Picard proof to prove this or do I need to start somewhere else?  I was also asked to show that this method satisfies  $|x^{[k+1]}(t)-x^{[k]}(t)|\le |x_0| $$\frac{π^{k+1}(t)}{(k+1)!}$ where $π(t)=\int^t_0||A(τ)||dτ$.  I have no idea where to start with this, but hopefully it will become clearer once I finish the first part.


I want to integrate some features like Live video streaming, Video chat, Video conferencing, related features as well. I want to integrate it in a PHP codeigniter project.   I am not acknowledged about the server configuration that is required if i use . I was trying a bit to integrate videowhisper plugin. When I am entering into the plugin then it says 'RTMP Server: NetConnection.Connect.Failed'.  It will be highly appreciated if anyone worked on such feature before; can help me out.   Thanks in advance  Nandinee


For the life of me, I can't delete folders and files from my second harddrive.  Does anyone know how to overcome this security "feature"?  I have followed guides online, and they generally say, set ownership, and set permissions to full Control.  I have even enabled the administrator account (my own account is an admin too), and tried it from there but no luck.  The screenshots below are me trying from the "adminstrator" login. Owner and permissions set.  It just keeps telling me I need permission from administrator. I AM ADMINISTRATOR ! (My pc is called Paul-PC)


CSS - Classes, IDs, and Elements: What's the Difference?

In CSS there are a few ways of addressing different elements. (I am going do use div elements in the following example.)  Classes - div.main {  IDs - #id-name {  Element - div {  Let's say I'm making a simple animation, and I want to make a p element spin.    p {   text-align:center;   font-size:40px; } #spinner {   animation-name:spin;   animation-duration:03s;   animation-iteration-count:infinite;   animation-timing-function:linear;  }  @keyframes spin {    from {      transform:rotateY(0deg);    } to {      transform:rotateY(360deg);    }  }
Hello, world!
     What would've been the difference if I would've included all of the animation parts in the p address where I made the text bigger and centered, or used a class such as p.main instead of an id called spinner? Is there a difference, or is it just preference?
Thanks!


Are prototyping boards suitable for 200V?

I have some prototyping boards like this:-      It's a standard 0.1 inch pitch and I like them.  Is this suitable for a medium voltage of about 200 V DC?  I'm concerned that the voltage might just repetitively creep /jump between pads right across the board.


how to update ubuntu os off usb (boot mode)

I am using Ubuntu 14.04.3 and I am running 64bit and it does not run well on my old laptop, I have downloaded the 32bit version and have made a U.S.B. disk, I just don't know what to do from now. How do I boot it from the U.S.B. drive? I have tried hitting all the Fn keys on boot up but this does nothing.


Should the Present Perfect be used instead of the Simple Past in the sentence "I was with my sister"?

Somebody (not a native speaker) told me that "I was with my sister" is grammatically incorrect and the present perfect tense should be used instead ("I have been with my sister"). Is this true?


In Dungeons and Dragons if a monster attacks and hits what happens with this damage: 4(1d4+2)? Do you add inside the parenthesis then multiply by 4?


Can’t access Grub to reset root password

I can’t seem to access Grub on my HP Stream laptop (model 14-ds0033nr). Laptop came with windows 10, and I’m currently using Ubuntu 20.04 LTS as the sole OS. My main issue is that I forgot my root password, and need access to Grub (I think..?) to change the password. I’ve tried F1-F12, ESC, Shift, E,C following Post and nothing seems to work. I appreciate any help you guys can offer


Downgrade android version from higher to lower?

Mostly, android devices get updates through OTA to higher versions. I had upgraded to Kitkat(MIUI6) version, on my Redmi 1S using OTA. I have downloaded complete ROM of Jelly bean(MIUI5). But, I cannot install directly, it shows error and failed. That means an upgraded device cannot downgrade by direct installation. What should be done? (Unrooted device)


I have heard that Google trust that website which has long expiry date. that want to know how can I register my domain for a long period.


iMessage doesn't say "delivered" or "not delivered"

I sent an iMessage from my iPod touch to my friends iphone on Monday. It didn't say delivered or not delivered. It was just nothing. His phone is on (I know because my other friends are iMessaging him) and my friend said her messages don't say "delivered" at the bottom but they still talk. Mine always say delivered at the bottom. So is this an error, like it didn't go through, or is he just ignoring me?


Using SharpZipLib to unzip specific files?

I'm trying to use SharpZipLib to pull specified files from a zip archive. All of the examples I've seen always expect that you want to unzip the entire zip, and do something along the lines of:         FileStream fileStreamIn = new FileStream (sourcePath, FileMode.Open, FileAccess.Read);          ZipInputStream zipInStream = new ZipInputStream(fileStreamIn);         ZipEntry entry;          while (entry = zipInStream.GetNextEntry() != null)         {             // Unzip file         }   What I want to do is something like:  ZipEntry entry = zipInStream.SeekToFile("FileName");   As my needs involve using a zip as a package and only grabbing files into memory as needed.  Is anyone familiar with SharpZipLib? Does anyone know if I can do this without running through the entire zip by hand?


Blender 2.91.0 Broken Material in Material Mode and Render Mode?

thanks for checking in. So I was making this in Blender 2.91.0 But when I go to Material Mode, it becomes like this: If I rotate the camera while in Material Mode, it becomes this, the background leak into the model or something: The material is the default material. I made a new one but it's still the same. Changing the properties don't do anything. And this is how it looks like in Render Mode: And the render result: I'm using AMD Radeon RX 570 for VGA with driver version 20.12.1, does that mean anything? I haven't use Blender for texturing since I got this computer, so I don't know when was the last time it worked. Before I changed computer though, it work just fine. I've tried reinstalling Blender, redownloading, repairing, nothing fix it. Anyone know what's wrong? Thank you. u.u


NullPointerException while retrieving data from Firebase

I'm trying to set my TextView to the current user username but i'm getting this error:    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference   and this is how i'm retrieving the username:  mDatabase.addValueEventListener(new ValueEventListener() {         @Override         public void onDataChange(DataSnapshot dataSnapshot) {                 String name= dataSnapshot.child("username").getValue().toString();                username.setText(name);             }          @Override         public void onCancelled(DatabaseError databaseError) {             Log.w("ProfileActivity", "load:onCancelled", databaseError.toException());          }     });   this is my user node:     this:   mCurrUser = FirebaseAuth.getInstance().getCurrentUser();  Uid = mCurrUser.getUid();  mDatabase = FirebaseDatabase.getInstance().getReference().child("Users").child(Uid);


Select multiple rows with different criteria for each

I am trying to put together a query will return sales information across multiple date ranges. I was planning to do something like this:  SELECT count(*) AS thirty_day_sales FROM "MySchema"."MyTable" MT WHERE MT.date > now()::date - interval '30 days' UNION SELECT count(*) AS sixty_day_sales FROM "MySchema"."MyTable" MT WHERE MT.date > now()::date - interval '60 days' UNION SELECT count(*) AS ninety_day_sales FROM "MySchema"."MyTable" MT WHERE MT.date > now()::date - interval '90 days'   Is there another, more efficient way to do this that doesn't use UNION? I'd prefer not to have to repeat the SELECT and WHERE lines over and over, as the actual criteria are a lot longer and move convoluted than this, with multiple tables joined together.


when deleting multiple files or folders what do you recommend to be safe?

When it comes to removing files. Instead of  rm some_file.txt   or  rm -rf some_folder   we do  del some_file.txt   or  del some_folder   where you can define your bash alias for del in ~/.custom_aliases as  function del() {     mv $* ~/.Trash }   which just moves your files and folders to the trash such that you can recover them later.  What’s your choice?


I want to create one proxy server in c# which will accept request from client and route the request with another real proxy and return result back to client.  For Example:   Client send a request for www.google.com with proxy as my server IP. So, First this request will come to my proxy server. Then my proxy server need to route this request to google server with another proxy. So, the google would never the IP of client and my proxy server, it would be only knowing proxy address which is added by my proxy server. Result need to beck to client who originated the request.


I'm having issues while connecting to my Local Centos 6.3 VM with 500 MB ram.  Below is the output of ssh -vvv localhost connection:  OpenSSH_6.3, OpenSSL 1.0.1e 11 Feb 2013 debug1: Reading configuration data /usr/local/etc/ssh_config debug2: ssh_connect: needpriv 0 debug1: Connecting to localhost [127.0.0.1] port 22. ^^^^^^^^^^ Loading this statement takes more than a minute  debug1: Connection established. ...  debug1: Next authentication method: password  root@localhost's password: ^^^^^^^^^^ This step takes a minute too  debug3: packet_send2: adding 64 (len 50 padlen 14 extra_pad 64) debug2: we sent a password packet, wait for reply debug1: Authentication succeeded (password). Authenticated to localhost ([127.0.0.1]:22). debug1: channel 0: new [client-session] debug3: ssh_session2_open: channel_new: 0 debug2: channel 0: send open debug1: Requesting no-more-sessions@openssh.com debug1: Entering interactive session. debug2: callback start debug2: fd 3 setting TCP_NODELAY debug3: packet_set_tos: set IP_TOS 0x10 debug2: client_session2_setup: id 0 debug2: channel 0: request pty-req confirm 1 debug2: channel 0: request shell confirm 1 debug2: callback done debug2: channel 0: open confirm rwindow 0 rmax 32768 debug2: channel_input_status_confirm: type 99 id 0 debug2: PTY allocation request accepted on channel 0 debug2: channel 0: rcvd adjust 2097152 debug2: channel_input_status_confirm: type 99 id 0 debug2: shell request accepted on channel 0 Last login: Wed Oct  9 13:27:02 2013 from 10.0.0.2   Please suggest on how do I get rid of this delay.


audio track and video track are not the same length

Given that av sync is on and the correct fps is set, why would the audio track and the video track not be of the same length. When the video file is played in a media player, no such problems occur, but when placed into blender's video editor, the total length of the video is longer than that of the audio. this varies from a short 8 second video with a 1 frame difference to a 2 hour long video with several thousand frames of difference. Also the audio does lag behind the video accordingly, but it takes a minute or so to really notice it desyncronising.


Should there be commas before sentence-ending words such as 'too', 'either',  'apparently', 'obviously' and 'respectively'?   He wants to go to the mall, too.  She's not attending the meeting, either.  He is upset, apparently.  She won't be going now, obviously.  Mike and Bob scored 10 points and 14 points, respectively.    Is there a rule about whether to include or omit the commas?


how to add/install a public key in windows?

I'm trying to login to a windows pc from another windows pc using putty on the client pc and openssh on server pc. I can already connect to the said pc by entering username and password.  But I wanted to login using key pair that I already generated using puttygen.  How am I going to add the public key to the server (windows pc)? Where do I put the public key?  Additional information:    I managed to add the public key by using winscp from the client computer to install the public key to the server at the location: c:/users/myusername/.ssh/authorized_keys.  But when I try to login using the privatekey it says "the server refused our key".  I have read that I have to put permissions to the .ssh folder and to the authorized_keys file for it to work.  Ive seen examples on this but in linux, but how to exactly do this on windows?  There's only one user in the machine im trying to login and it's also the administrator if that info helps.


What adjustments should be done for a SSD?

I have recently upgraded my desktop PC and installed a SSD as system drive.   I read somewhere that these drives "don't like" being written on too much and that one needs to enable/disable certain OS features for such drives.  I checked the properties for the drive C: in Windows 8 and here's what I got.      Q1: As you see Allow files on this drive to have contents indexed in addition to file properties is checked. Does it need to be checked for that drive?  Q2: Is there anything else that I need to change in the settings to accommodate for the SSD?


Limit the number of suggested edits that a user can make in a day

I'm throwing this feature request out in response to the following two questions.       The current system for suggested edits seems to work perfectly fine in all cases but one: when a user (or group of users) decides to search for possible typos and edit posts en masse. I entirely agree with .        I do not believe it is possible to fix all the issues that might exist in the posts this way.   If you don't have edit privileges, you're causing work for users. Now, nobody minds this, unless you're not fixing all the issues in a   post and it's clear there's no thought going into the process at all.   Editing bumps things to the SO home page. Again, nobody minds and this is by design, but if you're fixing one tiny issue, is that a   reason to bump 100 questions to the home page? I'd say if you're   fixing all the issues with a post - including flagging what should be   flagged, closing what should be closed etc - great. If you're not,   you're bumping a whole lot of stuff...      There are a few more issues to consider, as well.   Even though a single user can (theoretically) suggest an unlimited number of edits, reviewers are limited in the number of edits that they can accept or reject per day. Most behavior on the Stack Exchange network is rate-limited: why shouldn't suggested edits be, as well? A single user's suggested edits can take up a disproportionate amount of the reviewers' time.   I therefore propose placing a limit on the rate of each user's suggested edits. There are a number of ways we could do this.   Limit the number of suggested edits per user per day—to approximately 100? This is a high enough threshold for any reasonable number of daily edits, and besides, after 100 suggested edits get approved there's no rep in it for the editor anyway. Limit the number of suggested edits per user per hour. Limit the number of outstanding (unreviewed) edits per user at any given time.   I personally like the last solution because it would encourage people to spend more time on each suggested edit and it would optimize for the valuable resource that is being spent on each suggested edit: reviewers' time.


Initially, I know that:   Convergent sequences are bounded. A sequence is convergent if and only if it is Cauchy.   Theorem. All Cauchy sequence are bounded.  My proof trying. Let $x_n$ be a Cauchy. Then, $x_n$ is converget by the $2$. So, by the $1$, $x_n$ is bounded. Hence, directlty, did I prove the theorem? Because $x_n$ is bounded.


How do you discourage "player knowledge" as a GM?

As a trivial random encounter is winding down, a player thinks "That was too easy... The GM wouldn't give us an encounter that doesn't give XP," and starts searching for hidden bad guys or other clues. There are four statues in a room, and you use miniatures to represent them. The players think to themselves "Well if the GM used miniatures, these things are definitely coming to life," and get ready to fight. When you lay down a map of a seemingly random part of the forest trail, the players think "This must be important, let's search around / prepare for battle." You roll a 1 for a player's knowledge check and feed them inaccurate information. They saw the roll and know you're full of it.   Even the most disciplined players sometimes will take advantage of "Player Knowledge" over "Character knowledge." Sometimes it's hard to even tell the difference. You know that you should switch to your frost battleaxe against that Fire Demon, but does your city-raised fighter with the intelligence of an old boot know?  What strategies are there to discourage the use of player knowledge, and how can you cut back on perceptions that players have of the genre itself?


Let $x,y,z \in \mathbb{R} $ Show that $ xz \leq yz  $ $ \land$ $ z > 0 $ $ \implies  x \leq y $.   Prove:   $ xz \leq yz  $ $ \implies 0 \leq yz -xz  \implies 0 \leq (y-x)\cdot z$  (For the next step, i want to use an axiom of the real numbers: for all $a,b  \in \mathbb{R} $  follows that $ 0 \leq a $ $\land$ $0 \leq b$ $\implies$ $0 \leq a\cdot b$.)  So by condition  $ z > 0 $ but i also must show that $0 \leq (y-x)$ how can i do these ?


I'm just a little confused on this. I'm pretty sure that I need to use indicators for this but I'm not sure how I find the probability. The question goes like this:     A company puts five different types of prizes into their cereal boxes, one in each box and in equal proportions. If a customer decides to collect all five prizes, what is the expected number of boxes of cereals that he or she should buy?   I have seen something like this before and I feel that I'm close, I'm just stuck on the probability. So far I have said that $$X_i=\begin{cases}1 & \text{if the $i^{th}$ box contains a new prize}\\ 0 & \text{if no new prize is obtained} \end{cases}$$ I know that the probability of a new prize after the first box is $\frac45$ (because obviously the person would get a new prize with the first box) and then the probability of a new prize after the second prize is obtained is $\frac35$, and so on and so forth until the fifth prize is obtained. What am I doing wrong?! Or "what am I missing?!" would be the more appropriate question.


How can I calculate $24^{33} \mod 80$. I don't see how to start. I only know that $\phi (80) = 32$. A hint would suffice, thanks!


MYSQL 5.7: Password not generated after installation on CentOS 7 server

i just installed mysql 5.7 by following the guide in , after installing the server, the guide shows that after starting mysqld service, i should get the temporary password stored in /var/log/mysqld.log by using the following command  sudo grep 'temporary password' /var/log/mysqld.log   But this code shows nothing, i even searched the whole file and i don't find it.. i Checked if the service had problems starting, but it seems it's working right, and it even prompts me to enter the root password when i try to access mysqld, of course it denies the access as i don't have the password  Here is the log file just in case


Windows Server DNS with non-Windows (Linux, Mac) Computers

How do I get my non-Windows (Linux, Mac) computers to properly register their IP address into my DNS server?  Server Name: AD1 OS: Windows Server 2008 R2 Roles: DNS, AD, DHCP  DNS SETTINGS Dynamic Updates: Secure Only  DHCP SETTINGS Checked - Enable DNS dynamic updates according to the settings below.  Always dynamically update DNS records.  Checked - Discard A and PTR records when lease is deleted  Disabled - Name Protection  I've tried setting a DNS dynamic update registration credential user and then added that user to DNSUpdateProxy.  However, when I connect a Mac/Linux computer to the network, it'll get an IP from the DHCP server, but it will not add it's IP into the DNS.  I cannot add these computers to the Windows domain.  I've searched around but can't seem to find a definitive solution.  Any ideas?  EDIT I changed from secure only to unsecure and secure to see if it would resolve the problem.  It does not.  EDIT Okay so I look at my DHCP logs here is what I see:  10,04/30/14,12:15:52,Assign,10.10.3.58,m-pro.domain.local,28GFE112B263, 11,04/30/14,12:16:19,Renew,10.10.3.58,m-pro.domain.local,28GFE112B263, 11,04/30/14,12:16:36,Renew,10.10.3.58,m-pro.domain.local,28GFE112B263, 11,04/30/14,12:16:53,Renew,10.10.3.58,m-pro.domain.local,28GFE112B263,  The first number indicates the Event ID.  10        A new IP address was leased to a client. 11        A lease was renewed by a client. 30        DNS update request to the named DNS server 31        DNS update failed 32        DNS update successful  On Windows clients you'll see something like this:  30,04/30/14,10:14:38,DNS Update Request,50.3.10.10,court.domain.local,, 11,04/30/14,10:14:38,Renew,10.10.3.50,court.domain.local,8CA9830B1060, 32,04/30/14,10:14:38,DNS Update Successful,10.10.3.50,court.domain.local,, 30,04/30/14,10:14:43,DNS Update Request,50.3.10.10,court.domain.local,,  So it looks like the DHCP doesn't even initiate and update request to the DNS server.


When the array argi has more than one partition, its only begins to find word from the second url of the array, but why? Correct it please in code. Here the part of it: I make regular expresion for search by title in url:  private final Pattern TITLE = Pattern.compile("\\<title\\>(.*)\\<\\/title\\>", Pattern.CASE_INSENSITIVE | Pattern.DOTALL);   And searh logic here:  public String search(String url, String someword) {                      try {                         InputStreamReader in = new InputStreamReader(new URL(url).openStream(),"UTF-8");                         StringBuilder input = new StringBuilder();                         int ch;                         while ((ch = in.read()) != -1) {                             input.append((char) ch);                         }                         if (Pattern.compile(someword, Pattern.CASE_INSENSITIVE).matcher(input).find()) {                             Matcher title = TITLE.matcher(input);                             if (title.find()) {                                 return title.group(1);                             }                         }                     } catch (IOException e) {                         e.printStackTrace();                     } catch (PatternSyntaxException e) {                         e.printStackTrace();                     }                     return null;                 }              String[] argi = {"http://localhost:8080/site/dipnagradi","http://localhost:8080/site/contacts"};                                  for (int i = 0; i < argi.length; i++) {                                      String result = search(argi[i], word);                                      if (result != null) {               str = "Search phrase " + ""+ word + "" + " have found " + "" + result + ""+ "

";                       }                                     else{                                         str="Search word not found!";                                     }                                          if (word == null||word=="") {                                          str = "Enter a search word!";                                       }                             }                             return null;                   }


Why does evolution not make our life longer?

Why does evolution not make life longer for humans or any other species?  Wouldn't evolution favour a long life?


Pipe echo of change the current directory to sh does not work

If I do the code:  echo "printf 'working'" | sh   the code prints out working  but when I want to change the current directory this way:  echo "cd ../" | sh   the current directory isn't changed.  Do you know the reason behind that behavior? do you know how to echo cd command to sh in a working way?


How do I install Adobe Flash for use with the Chromium browser (pepperflash)?

I am running Ubuntu 13.10 and would like to use Adobe flash in Chromium (or Chrome). How can I do this? If not possible, what linux software is available that will work with flash files?


I have been trying to prove $$ \sum_{m=1}^\infty\sum_{n=1}^\infty \frac{1}{(m+n)^2}=\infty $$  I tried interchanging the sums, but the problem essentially same. I am also aware that: For $a_{m,n}\in [0,\infty]$ $$ \sum_{m=1}^\infty\bigg(\sum_{n=1}^\infty a_{m,n}\bigg)=\sum_{k=1}^\infty a_{\psi(k)} $$ where $\psi:\mathbb{N}\to\mathbb{N}\times\mathbb{N}$ is a bijection.  I could not find a way an appropriate $\psi$ to show that the latter one diverges. Any help is appreciated!


What does [^)] do in this regex / *\([^)]*\) */g

I am able to achieve the same functionality using the regex / *\(\w+\) */g but i wanted to know what does [^)] do in the following regex expression  let str = "Hello, this is Mike (example)"; str.replace(/ *\([^)]*\) */g, "");


Is conventional flow a real, physical thing or is it something we made up?

Is conventional flow a real, physical thing or is it something we still use for historical reasons? • Electron flow is the actual current flow and the textbooks are the other way because of Benjamin Franklin. • Conventional current is real and electrons just go the other way. I know nothing about this and searching on the internet just made me even more confused.


An object which is projected from the ground with an angle of $\theta$ passes two walls(without touching) within its motion.The wall which has a height of 'a' is situated in a distance of 'v' from the projected place and the other wall  which has a height of 'b' is situated in a distance of 'a' from the first wall. Find a expression with a and b for the  $\tan$ value of the $\theta$.     I tried to find the $\theta$,  $\rightarrow  s = ut \\ v=u\cos\theta.t_{1}\\$  $\uparrow s=ut+\frac{1}{2}at^{2}\\ a=u\sin\theta\times\frac{v}{ucos\theta}-\frac{g}{2}\times\frac{v^{2}}{u^{2}\cos^{2}\theta}\\ a=v \tan\theta-\frac{gv^{2}\sec^{2}}{2u^{2}}$  $\rightarrow s=ut\  v+a = u\cos\theta\times t_{2}$  $\uparrow s=ut+\frac{1}{2}at^{2}\\ b=u\sin\theta\times\frac{v+a}{u\cos\theta}-\frac{g}{2}\times\frac{(v+a)^{2}}{u^{2}\cos^{2}\theta}\\ b=(v+a)\tan\theta-\frac{g(v+a)^{2}\sec^{2}\theta}{2u^{2}}$  I don't see a way to find the $\theta$.Please help.


As the title states, I'm getting the following error when attempting to use a ASP.NET webapp:  Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: 192.168.x.x]  This is from the "Application" log on the SQL server. I currently have a clustered setup (using Microsoft Failover Cluster) although the second node has not been configured yet. I've tried configuring SPNs:  setspn -L myserviceaccount  Registered ServicePrincipalNames for <DN>:         MSSQLSvc/*SQL.corp.*.local:1433         MSSQLSvc/*SQL.corp.*.local   And indeed, SQL Server does register it correctly as per its logs:  Message The SQL Server Network Interface library successfully registered the Service Principal Name (SPN) [ MSSQLSvc/my.sql.fqdn ] for the SQL Server service.   However, the query SELECT auth_scheme FROM sys.dm_exec_connections WHERE session_id = @@spid ; returns NTLM and not Kerberos. I've restarted the server a few times to no avail. SQL Server runs under a domain user account with the appropriate delegation privileges.  Am I missing something?  UPDATE:  I was successfully able to get the SQL Server to use "Kerberos" as per the above query, but I'm still having no luck getting the IIS level to work.


How to hide the one-pixel leftover from the taskbar after activating the “Auto-hide the taskbar” option?

Activating the “Auto-hide the taskbar” option from Taskbar’s properties doesn’t hide it entirely. A single pixel is left sticking out like a sore thumb and I don’t know to make it go away.   When the monitor was connected through DVI, there was an option available in monitor’s settings through which I could move the screen just several pixels left or right thus making the sticking out pixels invisible. After switching to HDMI, however, this option became unavailable and the roundabout solution stopped working.   says that the screen should be adjustable from NVIDIA’s control panel also, but there are no arrows there, which leads me to believe that it too is not applicable to HDMI.      From the NVIDIA Control Panel navigation tree pane, under Display,   click Adjust Desktop Size and Position to open the page.  Click the image that represents your VGA display.  Use the arrow keys on the image that appears to adjust your screen position until your desktop/image is no longer cutoff on any side.    The monitor is LG  23EA63 Video Adapter is GeForce GTX 285


What is best to use in written language: 'that is' or 'this is'

I am interested to know if in written formal language this is reads better than that is  She goes to the library every Friday, and that is/this is her weekly respite.  Also, I often come across expressions like  That /This is (the reason) why  If I use 'this' rather than 'that' in a written text, does it raise the level of the language, or does it not make any difference?


Why the frequency of single-core CPUs has stopped increasing?

I wonder why CPU vendors stopped producing CPU with frequencies above 3.0 - 3.6 Ghz and switched to using multi-core CPUs?  What was the reason behind this step? Was there a physical constraint or the new approach came up being more feasible?


I want to choose what sites appear in my feed

My feed shows questions from all SE sites, most of which are irrelevant to me.  I'm interested in physics, math, and programming, topics I find served well by the SE model.  There are many SE communities I have no interest in and even get annoyed when I see the kinds of questions and answers posted (ie, opinion based answers that are passed off as truths).    It would be much better if I could manually add each site I'd like to see questions from.


Why ajax loaded link not clickable on jQuery click event?

I called Ajax on button click, and I got response with link. Now I want to do some action on that link but I cant, why?  here is the ajax call:  $( document ).ready(function() {   jQuery(".rateReset").click(function(){      var data_item = jQuery(this).attr("data-item");      var data_target = jQuery(this).attr("data-target");      var me = this;      jQuery.ajax({         type: "POST",         url: "likevoting.php?data_item="+data_item+"&data_target="+data_target+"&interchange=yes",         success: function(data){            jQuery(me).closest("div.rateWrapper").html(data);         }    }); });   I got response like:  some text  lorem ipsume...  Now I want to add click event on 'link' text, how to do this.  Thanks


I saw the following "theorem" and its "proof".  I can't explain well why the argument is wrong. Could you give me clear explanation so that kids can understand.  Theorem: All natural numbers are equal. Let $a, b \in \mathbb{N}$, then a=b.  Proof by induction. Let $m=\max\{a, b\}$. We will prove that the theorem holds for all $m\in \mathbb{N}$. If $m=1$, then $\max\{a,b\}=1$, so $a=b=1$. Now assume that it holds for $m=k$ for some number $k$. Now let $\max\{a, b\}=k+1$. Then $\max\{a-1, b-1\}=k$ and thus by assumption $a-1=b-1$, so $a=b$. Therefore, the proof is complete.


What are direct experimental evidences that quarks exist?

Now we have very established model of quarks explaining fundamental strong interaction. What are experimental proofs for existence of quarks and what is the name of physicist which made them?


Still can't mount Windows 8 drive after restart

After following the instructions in other posts, I am still getting the same error when I try to mount my Windows 8 drive in Ubuntu 14.04 on a dual boot system. I have disabled fast start after shutdown, hybrid hibernation, and the preinstalled Asus Instant On service. I have tried restarting Windows rather than shutting down. In all cases I get the same error message:     Error mounting /dev/sda4 at /media/jesse/OS: Command-line mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177" "/dev/sda4" "/media/jesse/OS" exited with non-zero exit status 14: Windows is hibernated, refused to mount.   Failed to mount '/dev/sda4': Operation not permitted   The NTFS partition is in an unsafe state. Please resume and shutdown   Windows fully (no hibernation or fast restarting), or mount the volume   read-only with the 'ro' mount option.   I did not have the same issue before upgrading from Ubuntu 12 to 14.   For what it's worth my computer is supposedly a "hybrid" with an SSD drive installed, although I can't see that the SSD drive is being used at all with my present settings. Any thoughts?


http://book-pages.org/ylodesm automatically opens periodically

Whenever I connect my laptop to a charger, google chrome (my default browser) opens automatically with this webpage        and then this webpage starts opening up after every 15 minutes (roughly) continuously till the time laptop is on AC power. The moment it is discharging, the cycle stops and no more webpages open. I tried to monitor the change in processes list in task manager after connecting the charger but no known virus program found. Tried many anti-malware that cleaned the windows in safe mode but the problem is same (occurs only on charging). Whenever I google this particular thing the answer always is a long list of anti-malware programs (same as on superuser). I have tired many but none of them did prove useful so far.  This particular question is for only this particular type of malware (not to be confused with general virus infections and removal questions). Please provide specific answer if anybody has disinfected this particular Trojan only (again not the general virus removal tools)


Can a community have its own internal magic links?

I'm talking about , which are very useful while posting comments. We frequently use [tour] , [help], [ask], [ans] etc. while introducing new users about How Stack Exchange works. On Hinduism Stack Exchange, we educate new users about our . Though we have also  a link to that page in the new answer pop-up, we still frequently need to refer new users to the . So, can we (Hinduism Stack Exchange) have a [guidelines] magic link  pointing to ? Another example is [faq] referring the  instead of referring to the already having [tour] magic link. More generally, can a community have its own magic links? Presently by this question, I'm thinking of having internal magic links within the community or SE network unlike  that introduces or lists most of the external links.


Why is Ubuntu NOT checking whether an app is already installed?

It would be so nice if Ubuntu would not just install an app which is already installed! In 99% of the cases it makes absolutely no sense to install an app multiple times. Can I configure it somehow to check before blindly install an app? E.g.        Is there also a way to configure it that it updates an app if the version of the installed version is smaller than the new one?


I'm stuck with the proof of the following:  Suppose that $(s_n)$ converges to $s$, $(t_n)$ converges to $t$, and $s_n \leq t_n \: \forall \: n$. Prove that $s \leq t$.   I've tried starting with $s_n \leq t_n \: \forall : n$ and the definitions of each limit (i.e. $|s_n - s| \leq \epsilon \: \forall \: n > N_1$), but I'm not really getting very far. Any help is appreciated!


Please help me find out, I'm very curious about what this port could be and I have literally no clue to what it might be. If you know or have any idea please let me know!


Why use a superclass reference for an object?

Given the follow code:  public class Musician {      public void play() {         // do something     } }   .  public class Drummer extends Musician {      public void turnsDrumStick() {         // do something     } }   .  public class Guitarist extends Musician {      public void strummingStrings() {        // do something     } }   I can use polymorphism to do the following:      Musician m1 = new Guitarist();     Musician m2 = new Drummer();      m1 = m2;   However, I can't see the methods of the subclass:      m1.strummingStrings(); //COMPILATION ERROR!   If I use:  Guitarist m1 = new Guitarist();   Would not it be better? What is the advantage of using Musico type to reference an object of a subclass? Just a possibility I would be able to attribute m1 = m2;, for example?  Or are there other advantages?  I saw this post, but I'm still puzzled:


Prevent applications from opening browser

Is there a free application out there that will intercept requests from applications to open a URL and prompt me as to whether or not I want the URL to be opened? (For instance, after Adobe Reader installs, it opens its website to get feedback about the install process.)  Ideally, it would be lightweight software for just this task, but if a larger firewall/security app provides this feature, that would be acceptable.  I'm using windows 7 32-bit.  As stating in a comment below, the idea is that you don't want the browser to open (assume it's not already running), so an extension (e.g. for Chrome, ffox) wouldn't be relevant.


Everything I have read says that you do not need to soak lentils like you would beans.  Unfortunately the last several times I have cooked lentils they have seemed a little chalky.    Should I be soaking my lentils before I cook them?


When I am trying to render a donut it just does a checkered background and then crashes

I have already tried putting it into a new document. I haven't used Blender before this and have been following a tutorial.