Why are the failing addresses in Memtest86+ higher than my total memory?

Context Feel free to skip this section. I ramble a bit. This is a desktop computer. My motherboard is a MSI P67A-C45. The two memory modules are 4GB DDR3-1333 in DIMM 1 and DIMM 3, dual channel. A few months ago, I started experiencing random graphics glitches resulting in my video drivers (nVidia) crashing and restarting occasionally. This was especially bad when hardware acceleration was used, especially in 3D FPS games, even with the 10+ year old goldsrc engine. It would also happen when playing flash videos, and occasionally when doing nothing. Most of the time, it was fine. It was only after the system had been up for a while - uptime, time since last reboot, not hibernation. Once the glitches started, I had to turn the computer off and leave it off for a few minutes. I suspected the video card - perhaps overheating? But temperature monitoring programs reported GPU temp at a nice cool 40 degrees Celsius. More recently (last week or two), when leaving the computer on overnight, I wake up to find it had BSoD'd, with a memory related error. I'm currently rerunning Memtest86+, so I can't dig up the exact error message/codes, if anyone really wants them. At the same time, some programs started crashing randomly ("xxxx has stopped working." with a close button). This would happen to Firefox and the aforementioned FPS game. I don't really run anything else, and the crashes are random. That is, they could crash immediately or run fine for the whole time I use them (several hours). The troubleshooter's nightmare. Memtest86+ On the first run, somewhere over 12 hours, I got the following results:  There's a few irregularities. Firstly, I have 2x 4GB DDR3-1333 modules in DIMM1 and DIMM3, dual channel. This is reporting DDR3-8247, whatever that is. Secondly, all the failing addresses are outside my total RAM capacity. That's not all that much help when trying to figure out which module may be failing. Evidently, at least one is failing. I reseated the modules and tried again:  As you can see, the frequencies and latencies are completely different. The latency values are much closer to what I vaguely recall seeing in CPU-Z (or was that HWiNFO32?). This test has only just started, so it's entirely possible those values changed sometime during the test. Also, considering errors only started cropping up in the later passes, is it possible that this is an overheating issue? Consider I've been using this computer for about a year now, and only in the last three or so months have things happened. My main question remains: Why is the failing addresses higher than my capacity?


why am i getting 11mbps on a wireless-n network?

I have a "Linksys AC1200" router which supports 802.11ac and I have a Dell Latitude (with Win7) with a "Dell Wireless 1504 802.11b/g/n (2.4GHz)" network adapter. Since 802.11ac is backwards compatible with 802.11n, as I understand it, it seems like I should be getting wireless-n speeds. But I'm not.  When I right click on the network connection and select Properties I see that my speed is 11.0 Mbps. It seems to me that my network speed should be a lot faster. Any idea as to why it isn't?


I'm searching for a sci-fi short story. Back in about 1978, I read a story I'd swear was called "Footprints in the Sands of Time." I'm pretty sure it was written earlier, since it was in a class on classic science fiction. I think it was in a collection of short stories too. I've googled this and similar titles, but no luck.  The plot involves someone going back in time and leaving a capsule of radium behind to prove they made the trip. Time was described as a "coiled spring," where the successive turns were separated by 60 million years (I think).


In math, one often needs to put a letter inside the symbols <>, e.g. to denote a cyclic group <x> generated by some element x. However, plain text displays the symbols < and > as an upside down exclamation point and an upside down question mark, respectively, while math type displays a large space like so:  < x >    Is there some way to reduce this spacing?


I just started studying about batteries and battery chargers. I have this simple query so please help me out.  I am trying to charge my 3000mah li-ion battery. The battery voltage is around 3.6v and the charger regulates the 5v from the source to 4.2v. I connect the battery to the charger. Now what is the voltage at the output should I expect? Shouldn't the output voltage be at 4.2v so that the battery gradually charges to 4.2v ? I ask this because I am using Bq2057 IC and once I connect to the battery to the charger the output voltage is dropping to 3.63v.  My assumptions were, 1. I considered the charger as voltage source 2. Battery also as a voltage source  I experimented this buy connecting two DC voltage sources(5 and 3.3v) in parallel and measured the voltage at the node and it was 5v. So I was expecting the charger output to be 4.2v even when I connected my battery to it.    Thanks


How to find the maximum value for the given $x\cos{\lambda}+y\sin{\lambda}$?

How do I find the maximum value for $x\cos {λ}+y\sin {λ}$ for fixed $x,y$ and varying $λ$ ? I would appreciate if only hint is given.


How does training in batches help in obtaining a better deep learning model? What should one keep in mind while splitting data into batches?


In iPadOS 14.2, the on-screen keyboard has shrunk to a tiny size appearing on the left side. Apparently this is a new feature for one-thumb typing. How can I restore the large size, filling width of iPad?


Why does unanswered:newest show an answered question?

Look at the first question appearing in this photo:    Why does it show the question if it's answered?


I'm new to the LWC, Getting this error when I'm trying to push to the org since two days, Earlie some components worked well now even they are showing this error .There are no duplicates and I tried uninstalling salesforce CLI too. Please some one help me in this.


Solving Degree 2 Partial differential equation

Please, can anyone help me solving this problem?  $$\frac{\partial U}{\partial t}−(\frac{\partial U}{\partial x})^2=0$$  where $U=U(x,t)$  with side condition as $U(x,0)=\cos x$


Does influence on gravity increase with mass when velocities approach the speed of light?

In other words, when a particle's mass increases significantly as it approaches the speed of light (c), does its influence on gravity increase, and if so, does it increase proportionally?


Why is linear movement relative but rotation is absolute?

Rotation,at classical mechanics at least, is always absolute but linear movement is not.  What is the reason for this distinction?  I will add a second question. Why this is not the case in general relativity?


This question has been asked before, but the title of the post was so general that it received no sufficient answer.  What is the cardinality of the set of jewels and reflected jewels in Indra's Net?   For those who don't know, Indra's Net is a poetic image used in Hindu and Buddhist cosmology to represent the universe. Imagine a grid-like net with a countably infinite amount of intersections and at each intersection there is a jewel. Now, on the surface of each jewel there are reflected images of every other jewel in the net. And since each of these reflected jewels is a copy of the actual jewels, they also have an infinite amount of reflected jewels within them. And within that second level of infinite reflected jewels, each of them also have infinite reflections... and so on, and so on, forever.  Basically, Indra's Net is like the scenario of two ideal mirrors facing each other, only the number of mirrors is countably infinite.  I've been trying to picture this with the number line. The integers could represent the original jewels, and the non-integer rational numbers could represent the first level of reflected jewels. Just pair each integer n with every rational number greater than n but smaller than n+1.  But then, each non-integer rational number would then have to be paired with its own distinct countably infinite group of numbers to represent the second level of reflection, and then every number representing that next level of reflection would in turn need its own distinct countably infinite group of numbers to be paired with, and so on, and so on.   Are there enough real numbers for this? The continuum always surprises me. Thank you.  EDIT: Reading the answers to the first version of this question made me realize how I underestimated the power of the old "1,2,3...".   Now, I have a similar question to my previous one, but I want to change the image of Indra's Net a bit. Imagine the standard image mentioned above, but then project the starting position infinitely "deep down" the levels of reflection so that not only do you see the standard Indra's Net before you, but as you look "outwards" you realize that your position is just one of infinitely many reflections within a larger meta-reflection, which itself is just a one reflection within an even larger meta-meta-reflection, and so on and so on, there being no "actual" jewels to begin with. You can "zoom-in" and "zoom-out" forever in both directions.  Is the cardinality of reflected jewels in this altered Indra's Net also the same as the set of integers?   Thank you.


I have this :    .themeMenu {   width: 100%;   height: 10%;   border: 0px;   overflow: hidden;   background-color: yellow; }  .Preview {   display: inline-block;   height: 100%;   width: 15%;   background-color: red;   margin-left: 2%; }  .mag {   display: inline-block;   height: 100%;   width: 15%;   background-color: green; }  .themeTitle {   display: inline-block;   height: 100%;   width: 20%;   background-color: green;   text-align: left; }

text here ruin it

     Problem : when I don't put text into themeTitle its aligned to the right just fine, but if I put one letter inside this div, all of it will go down so preview/mag are vertically aligned but themTitle goes down.   EDIT:  `vertical-align:top;`     will put the themeTitle in the same height with preview/mag, but the text will be on top, I need all of them to be vertically aligned to center :  ( preview | mag | themeTitle )


How do I perform a minimax ($L^\infty$) regression?

I will confine my question to the simple case of constructing a linear fit of one independent variable $X$ and one dependent variable $Y$, with no intercept term.  The sample predictions are $\hat y_i = \beta x_i$. Define the $p$-norm as  $$L^p = \left(\sum_{i=1}^n \vert y_i - \hat y_i \vert^p \right)^\frac{1}{p}$$  And define the $L^p$-regression of a sample $\lbrace x_i, y_i\rbrace_{i=1}^n$  as  $\beta$ such that $L^p$ is minimized.  I know how to do a least-squares ($L^2$) regression by solving the normal equations. I have also seen a linear programming procedure that does $L^1$ regression (minimizes the mean absolute error). And in the general case, you can define a reasonable search space and use numeric methods to find $\beta$ for arbitrary $p$.   I am wondering about the $p=\infty$ case. It can be shown that   $$L^\infty = \max \lbrace \vert y_i - \hat y_i \vert \rbrace$$  so an $L^\infty$ regression would amount to finding the value of $\beta$ that minimizes the maximum error.  Can this be solved explicitly, or do I need to use numeric methods?


how to extract body contents using regexp

I have this code in a var.  <html>      <head>         .         .         anything         .         .     </head>      <body anything="">         content     </body>  </html>   or  <html>      <head>         .         .         anything         .         .     </head>      <body>         content     </body>  </html>   result should be  content


How to curve text (or "bend" it) in MS Word?

How do I curve text in a word? I was able to do in a previous version of word. I was able to bend any word.   I have tried the word art option and it allows only shadowing but not the option to curve a word.


INSERT INTO EMP (EMPNO,ENAME,JOB,MGR,HIREDATE,SAL,COMM,DEPTNO) VALUES  (7499,'ALLEN','SALESMAN',7698,'20-Feb-81',1600,300,30)       , (7521,'WARD','SALESMAN',7698,'22-Feb-81',1250,500,30);   Tried to insert two rows at the same time. but failed saying "SQL command not properly ended". Can someone please correct the query?  Error:     Error at Command Line : 18 Column : 125 Error report - SQL Error: ORA-00933: SQL command not properly ended 00933. 00000 - "SQL command not properly ended" *Cause: *Action:


How to compute the sum $\sum_{n=0}^\infty \tfrac{n^2}{2^n}$?

How to find this sum : $\sum_{n=0}^\infty \dfrac{n^2}{2^n}$  $\sum_{n=0}^\infty \dfrac{n^2}{2^n}=\dfrac{1}{2}+\dfrac{4}{4}+\dfrac{9}{8}+\dfrac{16}{16}+\dfrac{25}{32}+\dfrac{36}{64}+\dfrac{49}{128}+\dots$ Now $\sum_{n=0}^\infty \dfrac{n}{2^n}\leqslant \sum_{n=0}^\infty \dfrac{n^2}{2^n}$ And I know that $\sum_{n=0}^\infty \dfrac{n}{2^n}=2$. But how to find this sum ? I am confused.Please give some hints.


Why does type L not have any type parameters even though it extends ArrayList?

This is my code:  private <T,L extends ArrayList<? extends T>> L Foo(L<T> list1) {     L list2 = new ArrayList<T>();      //more code  }   I'm using IDEA and get the following error message for the method parameter:  Type 'L' does not have type parameters  and the following error message for creating the ArrayList:  Incompatible types.
Required: L
 Found: java.utils.ArrayList<T>;   Why does this happen? L extends ArrayList so it should have the same type parameters right?


I am trying to install debconf since it seems to be broken on my computer.   I ran the command:   apt-get -f install debconf   I got the following error message:  dpkg: error: unable to create new file '/var/lib/dpkg/info/format-new': No such file or directory E: Sub-process /usr/bin/dpkg returned an error code (2)   I don't understand this error message and I don't know what to do.   Thank you for your help.


How can a point hold mass or charge where it doesn't tell anything except position?

In geometry point is a dimension less quantity as it doesn't have length, breath or height. But when we define columbs law in electrostatics,  we define points holding charges or Newton's law of gravitation is primarily defined for point masses. So if a point doesn't have any dimension how can it have charge or mass  at all?


How do I resize partitions using command line without using a GUI on a server?

I only have access to the server via a terminal and I can't use graphical tools such as GParted! I want to create a new partition from a part of the root (about 768mb) for swap.  # df -h Filesystem      Size  Used Avail Use% Mounted on /dev/vda         20G  1.3G   18G   7% / udev             10M     0   10M   0% /dev tmpfs           199M  4.9M  194M   3% /run tmpfs           100M   12K  100M   1% /run/user tmpfs           5.0M  4.0K  5.0M   1% /run/lock


Why does 'safely removing device' from Ubuntu 18.04 takes ages?

I am using Ubuntu 18.04 and I sometimes write a large amount of files to an external hard disk (might take an hour or so). When that copy process is over I am clicking on      Safely remove drive   after wich a message appears     Device should not be unplugged   But that message is there for a LONG time! What can I do? Wait for 30 minutes? Or a day? Or a week?  What is going on? Why does it take so long time to safely remove the device? The data has been written, so what is going on?  How to improve/fix this situation?


Windows10 no longer stays asleep after configuring sshd

I've had Windows 10 Home Edition running for a year and half without problems. I set up my PC's power button to put the OS into sleep mode. The other day I was trying to set up sshd. I used Windows PoweShell to run some commands . Ever since then, Windows no longer stays asleep. I press the power button and Windows goes through the motions of going into sleep mode. It hums for a bit then the screen goes blank. But then after a few minutes, the screen turns back on and the log in screen is shown. Similar behavior happens when I enable Wi-Fi Mobile Hotspot, allowing me to tether my cell phone to my PC's internet connection. When I have Mobile Hotspot enabled, the computer refuses to enter sleep mode. I tried undo my sshd installation, but these commands didn't resolve the issue: # Uninstall the OpenSSH Client Remove-WindowsCapability -Online -Name OpenSSH.Client~~~~0.0.1.0  # Uninstall the OpenSSH Server Remove-WindowsCapability -Online -Name OpenSSH.Server~~~~0.0.1.0  So I'm at a loss of what to try next.


Lemma 8.2.5 Analysis by Tao (set theory)

Let $X$ be a set (which could be uncountable), and let $f: X \to \mathbb{R}$ be a function such that the series $\sum_{x \in X}f(x)$ is absolutely convergent. Then the set $\{x \in X : f(x) \not=0\}$ is at most countable. (Hint: first show if $M$ is the quantity    $$M : = \sup \{\sum_{x\in A} |f(x)| : A \subset X , \text{$A$ finite}\}$$   then the sets $\{x \in X : |f(x)| > 1/n\}$ are finite with cardinality at most $Mn$ for every positive integer $n$. Then use Exercise 8.1.9 (which uses the axiom of choice).      Exercise 8.1.9 shows that $\bigcup_{\alpha \in I} A_{\alpha}$ is at most countable if $I$ and $A_{\alpha}$ are at most countable.    Attept: We have that $\{x \in X: f(x) \not=0\} = \bigcup_{n \in \mathbb{N}}\{x \in X : |f(x)| > 1/n\}$. Then, the result follows from Exercise 8.1.9. But, I don't know how to prove the statement "$\{x \in X : |f(x)| > 1/n\}$ are finite with cardinality at most $Mn$ for every positive integer $n$". I appreciate if you give some help.


shellcheck reports:  echo -e "blah/blah\n$(cat "$tmpdir"/"$filename".jpdf)" > "$tmpdir"/"$filename".jpdf                           ^-- SC2094: Make sure not to read and write the same file in the same pipeline.                                                          ^-- SC2094: Make sure not to read and write the same file in the same pipeline.   The command is intended to insert a line blah/blah at the beginning of a file "$tmpdir"/"$filename".jpdf.   What does "Make sure not to read and write the same file in the same pipeline" mean?  What shall I do instead?  Thanks.


Why hide the Philosopher's stone behind solvable puzzles?

The purpose of placing the Philosopher's stone where it was placed was to hide it from Voldemort. Is there any in-universe reason why it was hidden behind a series of solvable puzzles? It looks like it was set up such that a worthy hero could solve the puzzles and get the stone (there were even written clues!), but surely the point was to hide it from anyone, including capable wizards such as Quirrel who might be helping Voldemort.  Why then not just hide it behind Snape's magical fire and not provide the potion, for example?  I understand that the purpose of the puzzle is to show Harry as a hero, so I'm not even questioning why the puzzles were easy enough to be solved by an 11 years old, but is there an in universe explanation why there were puzzles at all?


Is it possible to customize the shape of popups in OpenLayers? For example, I am creating a pop-up using the following approach:  var popup = new OpenLayers.Popup.FramedCloud(                 "popup",                 OpenLayers.LonLat.fromString(feature.geometry.toShortString()),                 null,                 '
'+feature.data.Name + '
test.url' + '
',                 null,                 true             );   This creates a popup with the following appearance:    Is it possible to change from the rounded corners and a curved 'connection' to a more square pop-up?


Separable extension iff $\Omega_{E/F}=0$?

I know if $E/F$ is a finitely generated algebraic extension of fields, then $E/F$ is separable iff the Kahler differential $\Omega_{E/F}=0$. Question: I wonder if we only assume that $E/F$ is algebraic without finitely generated, and  $\Omega_{E/F}=0$, then is $E/F$ separable? Edit:  doesn't solve my question, since the answer there uses the assumption that $E/F$ is finitely generated.


The integral $\int \sqrt{\ x \sqrt[3]{\ x \sqrt[4]{\ x \sqrt[5]{\ x \cdots}}}} dx$

I have no idea how to solve the second question from ,   $$\int \sqrt{\ x \sqrt[3]{\ x \sqrt[4]{\ x \sqrt[5]{\ x \cdots}}}} dx = \frac{x^{e-1}}{e-1}.$$  I tried to to find a value for the roots and i tried converting it to a power, and I tried making a $u$ substitution but nothing worked out, while i think that the right approach to this question is to convert the roots to a power, i cant find the right approach to the question.


This question is related to      I have what I thought is a fairly simple problem: Count non-negative   integer solutions to the equation      $$x_1 + x_2 + x_3 + x_4 + x_5 = 23$$      such that $0 \leq x_1 \leq 9$.   The difference here is on the constraint. It bounds all the $x_i$ under 10 : $\forall i\le5$ ,  $0 \leq x_i \leq 9$.  $8+8+0+0+7=23$ is accepted but not $18+3+0+0+2=23$ or $11+0+0+0+12=23$ . In other words all the $x_i$ must be usual digits.  Note that bad solutions may include one or two bad $x_i$. It is the main difficulty.  What is the count of combinations ?  Edit : this question includes a double bounds and a supplemental difficulty to find the right solution.


I am new to LaTeX, and I am having trouble with the first page since the first page is being treated differently from the rest. First custom headers and footers wouldn't apply to the first page, but I eventually fixed that. Now I have the following spacing issue:   I would like to have the same space before "Problem 1" that "Problem 2" has. In my example, the first page isn't a special page such as a ToC or anything. Being that I have already had issues with the first page, is there any way to signal to the compiler that the first page should get absolutely no special treatment so I do not have to worry about this issue again for something else? (Or perhaps creating a blank first page and then removing it from the final pdf file if that is possible)  Here is the code for the document if it helps:  \begin{document}  \setcounter{page}{1} \stepcounter{Problem} \section*{Problem \theProblem} \*Removed*\  \newpage \setcounter{page}{1} \stepcounter{Problem} \section*{Problem \theProblem} ...   I attempted to fix the problem by adding \null before \section*{Problem 1}, but this gave too much space, and I feel it would be unnatural and harder to maintain if I set the top margin by exact pixel values to line it up correctly.  Below I attached my formatting for the header.  \title{USAMTS Round 1} \author{Nicholas Pipitone} \date{September 2015}  \newcounter{Problem} \newcounter{Pages}  \pagestyle{fancy} \fancyhf{} \fancyhead[CE,CO]{USA Mathematical Talent Search} \rhead{Year: 27\\Round: 1\\Problem: \theProblem} \lhead{Student: Nicholas Pipitone\\Username: npip99\\ID\#: 99999} \rfoot{Page \thepage\ of \thePages} \renewcommand{\headrulewidth}{1pt} \renewcommand{\footrulewidth}{1pt}


Why use a controller and a presenter together?

Sorry for mistakes but I'm not a native English speaker.  In the clean architecture there is a controller and a presenter, what is the sense?  Is it the same controller as in the MVC pattern? Is it the same presenter as in the MVP pattern?  Why use both together?  Look at this:   Can you give me an example?  Is the clean architecture similar to ports and adapters? If yes, where are the adapters?


Is there a way to recover Pokeballs that miss?

Can you recover Pokeballs that miss when trying to catch Pokemon?


Non-finite clause complementation of complex transitive verbs

This question has been bothering me for a while. It came up when I was reading Chapter 16 of "A Comprehensive Grammar of the English Language."   How to explain the grammatical structure of the following four sentences?    "We knew him to be a spy." "I saw her leave the room." "I heard someone shouting." "I got the watch repaired."    What category do the four non-finite clauses in boldface fall into? They do not seem to fall into any of relative, nominal, comparative and adverbial clauses.


Proving this inequality $\left(1+\frac{1}{n}\right)^n < 3$

How would I prove this, particularly using a method using a geometric series and binomial coefficient. I'm having trouble giving a reason for $(\star)$ especially. This is what I did    For $n=1$, LHS = $(1+1)^1 = 2 < 3$ = RHS. Thus, for $n=2$, $$\left(1+\frac{1}{n}\right)^n \equiv {\large{\sum_{k=0}^n}} \begin{pmatrix}n \\ k \end{pmatrix}\frac{1}{n^k} \\ = {\large{\sum_{k=0}^n}}\frac{n!}{k!(n-k)!n^k} \\ < \sum_{k=0}^n \frac{1}{k!} \\ < \sum_{k=0}^\infty \frac{1}{k!} \\ < \sum_{k=0}^\infty \frac{1}{(\frac{3}{2})^k} \qquad (\star)\\ = 3. $$    $(\star)$ since $k>2 > \frac{3}{2} \implies k! > 2 > \frac{3}{2}$ and $k! > (\frac{3}{2})^k$ for $k>2$.    I just know this to be true (the last step of raising 1.5 to the power $k$) by checking my calculator, but I don't see a reason why the factorial grows faster or becomes larger than the exponential.


Why does sort -k4nr and sort -k 4 -n -r give different results?

Here is my file, the first line is not part of it (the one with Fname ..)  Fname Lname Age Children  John  Doe   61  2 Mary  Jane  32  5 Delta Cross 30  5 Sui   Ace   24  1   I want to sort this file based on number of children. It should be sorted from most children to least children.  Here is my command: sort -k 4 -n -r file.txt, which says sort based on the 4th column, numeric sort, and reverse. This yields:  Mary  Jane  32  5 Delta Cross 30  5 John  Doe   61  2 Sui   Ace   24  1   The way my text does it is sort -k4nr file.txt. I have two questions regarding this:  Firstly, I thought our options must be separated by spaces (not joined together)? Is this not the case for sort, or not the case for any of the commands?  Secondly, when doing it this way, I get the "right" order, but Delta is first:  Delta Cross 30  5 Mary  Jane  32  5 John  Doe   61  2 Sui   Ace   24  1   Why is this?


Does it make any difference when you wrap food with aluminum foil for grilling or baking or making a steam pouch whether you put the shiny side in or the shiny side out?  I've seen at least one answer to a questiong about grilling that made mention of this.


Website to get in contact with an interface designer?

is there a popular website where I can order an interface design for an application to a fixed price or make an auction style request? Maybe something where I can browse the previous work of that designer?  Thanks


Is classical electromagnetism a dead research field?  Are there any phenomena within classical electromagnetism that we have no explanation for?


How to choose to which conference submit a scientific paper?

Nowadays, in almost every scientific field, there are hundreds of conferences. Many call for papers emails fill our mail boxes.  Freedom of choice is great, but, how to choose to which conference send a paper?  Should I choose one...   based on the scientific relevance? based on the scientific vicinity to your paper theme? based on its prestige? because of some official ranking? because it provides the best food?


If I add mods to a server, do the clients have to download them too?

I set up a Forge server, which works just fine.  I know that you need the client to be able to play in it, and I know that my friends needs it too.  But if I add mods to the server, do my friends have to download them as well? If so, where do they put them?


Memtest86+ does not work on efi system. Is there an alternative way?

It shows "unknown command linux16" when I run memtest86+ on efi system.


What is PEP8 actually for and why do I have to shorten my lines?

I'm doing a Python Project for homework and my my IDE (PyCharm) keeps telling me that my line is too long. I've done some research and I've found out that the rule is because of something called PEP8. However, I have not found a clear explanation of what PEP8 is, and I feel that understanding it may help with my programming ability. Can anyone help?  This question has been marked as duplicate so I'm going to explain how it is different. I have found that PEP8 wants you to make your lines shorter, but I wanted to know how it could benefit my programming skills. I know now, however, thanks to the help of an answer. I feel that I have learned something from this post, and so it should not be closed in case anyone has anything helpful to offer.


Compute $A^5-4A^4-7A^3+11A^2-A-10I$ for $A= \begin{pmatrix}1&4\\2&3\end{pmatrix}$ by Cayley-Hamilton

Question: Use Cayley-Hamilton theorem to express $A^5-4A^4-7A^3+11A^2-A-10I$, where $$A= \begin{pmatrix}1&4\\2&3\end{pmatrix}$$  Attempt: I only know how to get the characteristic polynomial equation which is $\lambda^2-4\lambda -5$ for that matrix. By definition $A^2-4A-5=0$. But where does that  5 degree polynomial come from?


We have a website math.tutorvista.com.   We use dynamic serving web pages.  Desktop URL:    Mobile URL:    I have a couple of questions on this:  1) Is it a Bad SEO to use Dynamic serving than Responsive web pages? 2) Should we use  "?view=simple" on to the URL to differentiate?  Thanks in advance!


I was browsing Reddit and I stumbled upon . It is a video on making duct tape glow a blue light by pulling two pieces of duct tape apart. Appearntly the glowing is caused by something called .      Triboluminescence is an optical phenomenon in which light is generated through the breaking of chemical bonds in a material when it is pulled apart, ripped, scratched, crushed, or rubbed. The phenomenon is not fully understood, but appears to be caused by the separation and reunification of electrical charges. (Wikipedia)   This doesn't tell me very much, mostly because I don't fully understand what "separation and reunification of electrical charges." really means. So can anyone explain how seperation and reunification of electric charges can give rise to this blue glow?


Equivalence of convergence of a series and convergence of an infinite product

Let $(a_n)_n$ be a sequence of non-negative real numbers.      Prove that $\sum\limits_{n=1}^{\infty}a_n$ converges if and only if the infinite product $\prod\limits_{n=1}^{\infty}(1+a_n)$ converges.   I don't necessarily need a full solution, just a clue on how to proceed would be appreciated.  Could any convergence test like the ratio or the root test help?


Glass is an amorphous polymorph of silicon dioxide, melted and quenched so that grain boundaries grow uniformly and are small with respect to visible light. Its an oxide not a metal and has a large bandgap so visible light doesnt excite the electronic structure.  Now i can imagine how some gases and solvents are mostly transparent dielectrics, but im having trouble understanding why glass transmits light coherently.  How do the little crystals in glass manage to all polarize the same way if they are arranged randomly and aren't free to move? I read glass molecules do move like a magma but very slowly. Is it just that the negative charge polarizes like in a leyden jar?  If thats the case why doesnt the motion of a gas or a fluid affect the coherent transmission of light?


Find this sequence $a_{i}$ such $\gcd{(a_{i},a_{j})}=\gcd{(i,j)}$

A sequence $a_{1},a_{2},\cdots $ of natural numbers satisfies   $$\gcd{(a_{i},a_{j})}=\gcd{(i,j)},\textrm{ for all } i\neq j$$      Prove that $$a_{i}=i\quad\textbf{for all } i$$   My approach is the following:  For any integer $m$,we have $$\gcd{(a_{m}.a_{2m})}=\gcd{(2m,m)}=m\Longrightarrow m \mid a_{m}$$  now I'm stuck and don't know how to proceed？


What will I see in oscilloscope when attempting to analyze Bluetooth or Wi-Fi signals?

I would like to know what will show up if I put bluetooth or wifi carrier signal (2.4GHz family) in a say 50MHz oscilloscope? Am I going to see something like a rectangular block? And the only information I will get is the amplitude?


How to HIDE "client denied by server configuration:" error in log

I want to block access to my web server by default as a precaution but I keep getting the following errors showing up in my error log.      [Wed Jun 27 23:30:54 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/Edu.jar      [Wed Jun 27 23:32:40 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/REST.jar      [Wed Jun 27 23:35:39 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/Set.jar      [Thu Jun 28 01:01:17 2012] [error] [client 58.218.199.227] client denied by server configuration: /home/www/default/proxyheader.php      [Thu Jun 28 02:34:57 2012] [error] [client 58.218.199.227] client denied by server configuration: /home/www/default/proxy.php      [Thu Jun 28 05:41:33 2012] [error] [client 58.218.199.227] client denied by server configuration: /home/www/default/proxyheader.php      [Thu Jun 28 06:55:10 2012] [error] [client 180.76.6.20] client denied by server configuration: /home/www/default/      [Thu Jun 28 07:31:26 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/Edu.jar      [Thu Jun 28 07:32:25 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/REST.jar      [Thu Jun 28 07:36:10 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/Set.jar   I don't really want these errors to show up but whatever I do, I can't get rid of them. Does anyone know how I can achieve this?  Here is a copy of my configuration.  <VirtualHost *:80>     DocumentRoot /home/www/default      <Directory />            AllowOverride None            Order Deny,Allow            Deny from all     </Directory>      #ErrorLog /var/log/apache2/error.log     #LogLevel warn     CustomLog /var/log/apache2/access.log combined </VirtualHost>


Trying to find a book about rediscovered space travel after interstellar war isolates planets

The book is written in the 1980s. The storyline is about an early 20th century level technology planet getting visited by a spaceship which causes quite a stir. The visitors start helping to consolidate all of the countries on the planet. Everyone thinks this is good but some people accidentally find out they're actually being conquered by using the planets own people to do the fighting.   They also find out that when all the planet's countries are defeated and under the control of a single government, the planet will be colonized by a space federation that is reclaiming long lost planets.  Through trickery they learn that if they can somehow get space travel they wouldn't be colonized and would have rights and a higher place in the federation. They start sneaking around trying to make a spaceship with their early 20th century tech.


I recently changed from iphone to android and i have been having trouble recieving messages from my iphone friends since my iphones screen is broken i cant do anything on it. Any way to fix this problem through icloud or something?


Apport is not creating .crash file for java crashes

I am having issues on production server, It is groovy/grails application and I am using quartz to run many crons.  There is one cron which is when enabled crashes the JVM. I have no idea why. I can't find any crash dumps or any logs.  I found that the JVM is calling apport for crash report but apport is ignoring it. I read that apport also creates something.crash file inside /var/crash directory but I don't know it is not creating for Java crashes.  Here's the log from apport.log file.  ERROR: apport (pid 2150) Fri Sep  5 05:29:31 2014: called for pid 2100, signal 11 ERROR: apport (pid 2150) Fri Sep  5 05:29:31 2014: executable: /usr/local/java/bin/java (command line "/usr/local/java/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djvmarg=-Xms1024m -Xmx4096m -XX:PermSize=128m -XX:MaxPermSize=1024m -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintTenuringDistribution -Xloggc:/usr/local/tomcat/logs/gc.log -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/local/tomcat/endorsed -classpath /usr/local/tomcat/bin/bootstrap.jar -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat -Djava.io.tmpdir=/usr/local/tomcat/temp org.apache.catalina.startup.Bootstrap start") ERROR: apport (pid 2150) Fri Sep  5 05:29:31 2014: executable does not belong to a package, ignoring   Please suggest me how to enable crash dump for apport or any other way to find out why java failed.   Let me know if you require any more information. Thanks in advance.


I want to debug in TSQL.When I start the debug the following message box popup. In SSMS v17.2    Then I see this message:    In Microsoft Visual Studio 2015 Server Explorer same Error:    Then I see this message:    Thank You!


How to disable PGBK ink on a Canon printer and use BK for black?

Many Canon printers (e.g. iX6500) have two types of black ink. Suppose you just want to use one - for example, you need to print something urgently, but there's a fault with the other type of black's ink cartridge and that's the type it is trying to use.   How can you force it to use the other type?


. Even poisons don't work on him. He seems immortal due to his regeneration powers.  Can he survive without oxygen while his body exists in full working state (I am not talking about skeleton-only Wolverine when his respiratory system is not available)?


Is camera flash actually harmful to infants or newborns?

I just got a new off-camera flash, and the instruction manual says:     Never fire the flash unit closer than 1 meter from infants.   This was a little startling to me, since one of the main reasons I bought the flash was to take photos of my newborn son.  On the other hand, knowledgeable sources on the internet seem to say otherwise:       Q: What long/short term risks are there to using camera flash in photographing a 2-month old?      A: None, shoot away.  -- John C Hagan III, MD, FACS, FAAO           Q: Can a camera flash harm an infant's eyes?      A: No, it cannot. Actually infants have more protection from a flash than adults since they are usually not interested in being photographed and do not look right at the camera. Also, they typically have smaller pupils. This means less light reaches the retinas. -- Don Bienfang, M.D.        Q: Can a camera flash harm an infant's vision?      A: The flash of a camera, even if used to take many, many pictures of your newest family member, should not harm an infant's vision. Although the flash seems very bright, it actually isn't much different from normal daylight. -- Leann M. Lesperance, M.D., Ph.D.   So what's going on here?  Are the makers of the flash just avoiding a lawsuit?  Is this a myth?  Or are the doctors just thinking about little on-camera flashes and neglecting to think about more powerful flashes?  (And if it's NOT a myth, can I assume that bounce flash is acceptable?)


Running ssh user@hostname takes ~30s. Here's the scenario:   this is a VM on the local LAN Windows and Mac machines get instant login am using Debian and I could reproduce with an Ubuntu machine someone using Ubuntu says that logging into my machine (local LAN) is also instant using hostname IP address takes about half as much time (~15s)   [update]  Using ssh -vvv user@hostname, here's where it waits the most:  debug3: authmethod_lookup gssapi-with-mic debug3: remaining preferred: publickey,keyboard-interactive,password debug3: authmethod_is_enabled gssapi-with-mic debug1: Next authentication method: gssapi-with-mic   And then it waits a bit here:  debug1: Unspecified GSS failure.  Minor code may provide more information Credentials cache file '/tmp/krb5cc_1000' not found  debug1: Unspecified GSS failure.  Minor code may provide more information Credentials cache file '/tmp/krb5cc_1000' not found


What would be a more straight forward readable way of these commands?  And why exit 255 and not exit 1?  [ $# -eq 3 ] || { echo error ; exit 255 ; }  grep -q "string" && exit 0


Should I read Elantris before reading Warbreaker?

As far as I know, those two are set in the same world, but tell a different story, is that correct? I know that Elantris came out first, but it's not available for Kindle and Warbreaker is freely available from the author's website. I have never read anything by Brandon Sanderson and while this guy is writing the ending of the Wheel of Time series which I loved years ago, I'd like to get to know his style. Can I read Warbreaker first? Will I miss on something? Can it be treated as a standalone novel even if I don't know the other books in the same setting?


how to clean my enameled cast iron pot I burned soup dry in

A week ago, I left soup simmering in my new Staub cast-iron pot () for too long, and all the liquid evaporated and what was left burned on the bottom. I've scrubbed and soaked in hot water overnight for a week but there are still black, charred remains stuck to the bottom (see photo).   My questions:   Based on the photo, can you tell what is on the bottom? Is it burned food, or the enamel, or "seasoning" (I've never seasoned it myself...), or rust, or something else?  How do I clean and restore my precious pot to full health?


Does $|X|<|Y|$ imply $\mathcal{P}(X)<\mathcal{P}(Y)?$

This might be a terribly simple question, but I cannot convince myself whether the answer is yes or no. Maybe I am missing something simple. I am not well-versed in the area of elementary set theory so excuse the simplicity of the question. Note within a world where $\mathsf{GCH}$ is true we clearly have a yes; but with $\mathsf{GCH}$ false the answer is no longer obvious to me.  Exclude the triviality of finite sets. If $|X|<|Y|$ then $|X|<|Y\setminus X|$ so say $|X|=\kappa$, then $|Y|=\kappa+\lambda$ with $\kappa<\lambda$. But then proving $2^{\kappa}<2^{\lambda}$ is equivalent to the initial problem.  Am I being silly or is it consistent with $\mathsf{ZFC}$ that this implication is false?


How do I restart SSH service on Ubuntu 16.04?

Installed freshly Ubuntu Server 16.04 LTS including OpenSSH server. I now want to restart the ssh server by sudo restart ssh but then I get:     sudo: restart: command not found   Is restart not a default command or program or script, and how do I get it?


Question about electric flux in the corner of a cube

A charge $Q$ is places at the corner of a cube of side $a$. What is the electric flux through all the six faces of the cube? What is the electric flux on each one of it's faces?   I am aware of Gauss' Law, but, I don't know how the charge being in the corner of the cube instead of the center of a sphere affects things.


How to analyze lightly varying senses of adjective *very*

Use of very as an adjective is (in my experience) most frequently attested in phrases like     ...the very person I was looking for.   To use adjective very with the indefinite article sounds quite bizarre in this case:     ?...a very person I was looking for.   But consider this sentence, where indefinite a is used:     Visualizing a very transformation of the master-slave relation, Thomas presses further: the slave is brother to the master, even doubly a brother.   OED treats the two uses as separate senses of the word, with the following definitions:           (first use):      With limitation (usually expressed by the or a possessive) to particular instances      (second use): Really or truly entitled to the name or designation   Here are two respective examples quoted in OED:     What would you say to me now, and I were your verie, verie Rosalind? (1616)   Thence we went into Queen Mary's room, and saw that beautiful portrait—that very queen and very woman. (1857)   Clearly, the difference in meaning between the two senses is quite light, and it seems to me like a kind of difference which is recurrent enough to have its own term. What is the proper term? Are there other English words having similarly related pairs of senses? And lastly, is OED jumping the gun in treating these as two senses? Could the difference in meaning instead be due to the choice of determiner?


There's standalone MySQL server 5.5 with no slaves. Daily dump is created using mydumper tool.   Is there any way to verify created dump (all tables are created, integrity, etc.) without restoring dump somewhere, using slaves, etc..?


Is it possible to embedd this web app to my website

I am trying to embedd this website into my own website I have tried so using Iframe but the page is just blank.   The link I want to embedd is -   Or -   My Iframe :   <iframe src="https://www.zillow.com/homedetails/1-Anchorage-Way-APT-1505-Freeport-NY-11520/2094629656_zpid/" width="420" height="315" frameborder="0" allowfullscreen="allowfullscreen"><iframe>   Thanks in advance.


shell scripting if statement doesn't work

I wrote that script but if I run it I get this output:  ./autotex: line 7: syntax error near unexpected token `then' ./autotex: line 7: `            then'   The script is:  #!/bin/bash  while [ $key = "q"]; do          dateTex = grep $1.tex| cut -b 43 - 54         datePdf = grep $1.pdf| cut -b 43 - 54         if[$dateTex !eq $datePdf]         then                 pdflatex $1.tex         fi          read -t 1 -n 1 key  done


What's required to make the mirror modifier work properly?

I was working on a model when I realized something happened to the mirror modifier and it wasn't showing anymore. Tried Ctrl+Z but couldn't go back that far. So my question is there a way to apply the mirror modifier again? Here is what i mean:   I tried to make it work but the right half of my model doesn't mirror properly anymore.


I want to prove that $L^2$ is of the first category in $L^1$, thus I have to prove that $L^2$ is the countable union of nowhere dense subsets. The hint I get is: Take $g_n(x)=n$ for $0\leq x\leq\frac{1}{n^3}$ and show $\int{fg_n}\rightarrow 0$ for all $f\in L^2$ but not for every $f\in L^1$.   My question: What does this hint help for proving that $L^2$ is of the first category? I don't know how to use this hint. Can someone help me? :)  Thanks


Change Drush memory_limit on shared host

I've got problem using drush on shared host.  drush status shows:     Drush version          :  8.0-dev   and when I run:     drush php-eval "phpinfo()" | grep memory   It reporsts:     memory_limit => 1024M => 1024M   Which is quite big  But whenever I run drush cc all (this is D7 site) it  with:     Fatal error: Out of memory (allocated 61341696) (tried to allocate 79 bytes) in .../public_html/includes/registry.inc on line 41   I created drush.ini file in .drush directory and whatever I put there is reported by drush and drush status shows fail as loaded but memory limit does not go away.  Is it possible this error to come from drush version or what else could I ask hosting provider to change or check?  Edit:  When I add drush.ini file  in .drush directory with following in it:  memory_limit = 256M   and drush status   PHP executable         :  /usr/local/php56/bin/php-cli     PHP configuration      :  /usr/local/php56/lib/php.ini                               /home/tennist/.drush/drush.ini   PHP OS                 :  Linux                            Drush script           :  /chroot/drush/drush.php          Drush version          :  8.0-dev                          Drush temp directory   :  /tmp                             Drush configuration    :                                   Drush alias files      :   In /usr/local/php56/lib/php.ini  memory_limit = 1024M  In /home/tesnnist/.drush/drush.ini memory_limit = 256M  the command drush php-eval "phpinfo()" | grep memory reports:    [2] => --php-options=-d memory_limit="256M"  And after this drush cc all also fails when reaching 62M limit.


reRender commandButton depending on selectOption value in visualforce

In visualforce page I have a custom picklist with the values "Show" and "Hide" and two command buttons(Button A & Button B). When the picklist value is "Show", Button B needs to be displayed and when it's "Hide" then Button B needs to be hidden.  For that I have tried below code  Visualforce page :  <apex:page showHeader="false" controller="picklistRenderController"> <apex:form >     <apex:pageBlock >         <apex:selectList value="{!selectId}" size="1">             <apex:selectOptions value="{!display}"></apex:selectOptions>             <apex:actionSupport event="onchange" action="{!displayButton}" reRender="d"/>         </apex:selectList>         <apex:pageBlockButtons location="bottom" id="d">             <apex:commandButton action="{buttonA}" value="Button A"/>             <apex:commandButton action="{buttonB}" value="Button B" rendered="{!selectId=='show'}"/>         </apex:pageBlockButtons>      </apex:pageBlock> </apex:form> </apex:page>   Controller is :  public class picklistRenderController {    public List<selectoption> display { get; set; }   public String selectId { get; set; }    public PageReference buttonB() {      return null;   }    public PageReference buttonA() {       return null;   }    public PageReference displayButton() {        return null;   }     public picklistRenderController()   {      display =new List<selectoption>();      display.add(new selectoption('none','-select-'));      display.add(new selectoption('show','show'));      display.add(new selectoption('hide','hide'));   } }   But I couldn't able to get this work. Please help me on this.


Where can I find a list of domain names that I can download in a text file? I looked around and I found many sites with lists of expired domain names or domain names that will expire soon, but that's not what I need, I need a list of CURRENTLY REGISTERED domain names. The closest I found was this site (hxxp://www.list-of-domains.org/), but what I'm looking for ideally is just a plain list of registered domains and not some web links split across many pages full with ads and no text file. I know it's possible, after all how do these sites get the list of domains that they use? Where can I find such a list?


Does the range of a variable make a difference to its weight in principle component analysis?

I have a set of 6 statistics which I have measured on many simulations, and I have combined them using PCA to use just the two first principle components. But looking at the relative importance of each of the statistics in my PCs, some of them seem to have surprisingly low weights given that I know they separate my simulations very well.  To give an example, statistic A varies very nicely across my simulated parameter space with small standard deviations, but has weights of less than 0.1 in most of the principle components!   I have noticed that statistic A has a small dynamic range (varies between 0.01 and 0.2) while others have much bigger ranges (varying form 2 to 8, for example). Would this cause it to have a lower weighing in my analysis?


Why LuaTeX does not open file without extension?

LuaTeX-0.80.0  Suppose in current directory we have a simple text file, called text (without extension). The following code gives error in LuaTeX, but works fine in TeX. Why? Is there a simple workaround to make this work?  \newread\infile \openin\infile=text \ifeof\infile \message{I am not able to open the file for reading} \fi \closein\infile \bye   The answer should remark specifically which design decisions in LuaTeX justifies this odd behavior. Is this just a bug which has not been fixed or it is intentional?  Besides, are there any reasons why luatex must append .tex extension in opening file for writing? Why always force an extension if files can quite reasonably be used without it?


Add modifier to selected and another to active object

I am trying to set up an operator to use the BoolTool after I set a position and modifier on Selected object and a different one on the Active object. I basically need to move the selected object up in Z and add a solidify modifier at .3 thickness, and to the Active I need to add a solidify at .1 thickness and remain in original position.  I thought I understood how to get this to work, but all I get is both modifiers on the Active object. Any hint as to where to go from here?  class SolidfyDifference(bpy.types.Operator): """Solidify and Difference Mask""" bl_idname = "object.solidfy_difference" bl_label = "Add Solidy and Difference Bool" bl_options = { 'REGISTER','UNDO' }  def execute(self, context):     scene = context.scene      sel = bpy.context.selected_objects     act = bpy.context.active_object        for obj in sel:         if obj != act:             bpy.ops.object.modifier_add(type='SOLIDIFY')             bpy.context.object.modifiers["Solidify"].thickness = 0.1        return {'FINISHED'}


Why does Molly Weasley remember a different gamekeeper?

In Goblet of Fire, when Molly and Billy Weasley come to visit Harry before the Third Task, Molly talks about Hagrid’s predecessor.  Mrs. Weasley was intrigued by the Whomping Willow, which had been planted after she had left school, and reminisced at length about the gamekeeper before Hagrid, a man called Ogg. — Goblet of Fire, chapter 31 (The Third Task)  But wouldn’t Hagrid have been gamekeeper when she was in school? Hagrid was kicked out at 13 around 1943 and began training as gamekeeper. Molly would have arrived at Hogwarts in the early 60s when Hagrid would have been 30. Even if he was still in training or assistant gamekeeper, he would definitely still be there with Ogg. And as Ogg is described as the gamekeeper before Hagrid, that seems to imply that they weren't there together in Molly's memory. How does that work?


How to escape [ bracket while using sed command?

i have one variable  e.g.   var1="<envpath>/home/genl/jeenk[path]/OT/</envname>"   and having <envpath>/home/genl/jeenk[path]/OT/</envname> entry in file.txt  but if i try to change this by using sed command its not changed.  e.g.  sed -i "s|$var1|/home/genk/g" file.txt   what could be the solution to this, to escape [ & ] in var?


Why is there a NVIDIA logo in the [GPU] and [GPGPU] tags?

Possible Duplicate:          I'm not sure if this is a very recent change, but I have noticed that some of the tags I follow (CUDA, GPU and GPGPU) have the NVIDIA logo applied to them.  While for CUDA this is of course completely reasonable, it seems a bit much to me to apply this to GPU and GPGPU. Even though my hardware of choice is NVIDIA and has been for years, I do acknowledge the existence of AMD and their contributions in this area.  I have found some information on sponsored tags. Is it the case that NVIDIA is sponsoring these particular tags? (Clicking on the tags does reveal some "sponsored links") If so, is the possible competition taken into account when it comes to sponsoring? Or is it simply first come, first served?  Update:  Given @Balpha's , should the NVIDIA icon still be part of the tag? Or should it be removed there as well? After all, the comment states:     icons on tags only are allowed if the sponsor "owns" the tag.


So I installed the XAMPP with a .run extension by running chmod+x filename.run and it git installed. But now I want to uninstall it. How do i do so?


I am using <a> tags for links on a web page. How do I disable the Tab key from selecting either of them?


$\mathrm{Re}(i) = 0$, but the fourier transform of $f(x) = e^{-ix^2}$ is $g(\alpha) = \sqrt{\pi\over i}\times e^{i\alpha^2 \over 4}$, is it not?   Is there an easy to show that it is so, knowing the fourier transform of $h(x) = e^{-x^2}$? (It is $k(\alpha) = \sqrt\pi\times e^{-\alpha^2 \over 4}$.)  The non-unitary, angular frequency Fourier transform is taken into consideration.


For enterprise web-based software, which is best Log In/ Log Out vs. Sign In / Sign Out

The last time this question was asked on this platform was 3-4 years and not specific to enterprise SaaS ago, so it's time for an update as our field moves quickly.  Based on latest research/work, when is it best use Log In/ Log Out vs. Sign In / Sign Out for enterprise SaaS software?


Triggered abilities from multiple players. Whose resolves first?

If triggered abilities from sources controlled by multiple players all trigger at the same time, in what order do they resolve?  For example, if I control  and at least two other creatures on my side of the field and my opponent plays , can I use Obezdat's ability of exiling him to save him from Archfiend's ability at the end step? Since both abilities trigger at the beginning of the end step, whose ability resolves first?


I see many of you don't like greetings for some reason. Before you comment, let me refute some of them already.  One of your arguments is "when someone says hi, they're not really saying hi to me". Yes they are. Not only to you, but to everybody, because it isn't feasible to greet each person.  What's the big deal with that? Automatic systems for filtering? Come on... do I force you to greet anyone and add it to your questions? No! Why should you force me to NOT greet people? To "save text"? Why not limit vocabulary, BTW, and turn all question into ? That would certainly save text.    What about jokes, analogies and other related expressions? Even writing style itself, I myself have a writing style that takes up some more space than possible, and many people do. Should that be fixed to conform to some standards? The important thing is not to type as little as possible, but to be understood. Would you prefer more machine-like questions?  Questions are not programs you need to optimize to avoid losing time. I enjoy knowing someone will read what I wrote, knowing I'm not just writing to a machine that doesn't feel, but to an actual person that might be offended if I downvote, and happy if I help.


Is there any way to list which scripts and styles have been enqueued, while within wp-admin?  For example this code works, but only if you are on the frontend. How could I get the same list while staying in wp-admin?  function dc_list_scripts() {     global $wp_scripts;     $enqueued_scripts = array();     foreach ( $wp_scripts->queue as $handle ) {             $enqueued_scripts[ $handle ]['handle'] = $wp_scripts->registered[ $handle ]->handle;             $enqueued_scripts[ $handle ]['src'] = $wp_scripts->registered[ $handle ]->src;     }     print_r( $enqueued_scripts ); } add_action( 'wp_print_scripts', 'dc_list_scripts' );   If I run the above code in wp-admin then I get a list of scripts and styles enqueued within wp-admin. That's not what I want, I need to know which resources are enqueued for the frontend.


I'm a regular reviewer of Stack Overflow. Usually when I down vote any question or answer, I put comments. So that the OP can improve. But recently when I put comment, Within seconds I get one or two down votes for any of my questions.  Usually these down votes won't come under serial down voting, because I'm getting 1 or 2 down votes.  How to handle this situation ? Is the only solution is not to put comments when I down vote ? But I don't like that, because when I get anonymous down votes without reason, I'll get irritated. I know if I do anonymous down vote another person also feel like me, that's why I'm putting comment.  I think the pattern of down vote is like this:   I down vote and put comment OP will select my name and check my profile OP will choose any one or two questions from my profile Down vote it   Is there a way to identify and block this pattern of downvotes?


When I installed Ubuntu, I setup an encrypted home partition. Now I have come to an issue where I am running out of memory because I haven't setup swap. How can I setup an encrypted swap file?  A couple of times while booting I've seen some reference to cryptswap. I've also got these lines contained in /etc/fstab  # swap was on /dev/sda6 during installation #UUID=1ba8a53b-1842-4de7-8e38-2d6c79f3a1ab none            swap    sw              0       0 /dev/mapper/cryptswap1 none swap sw 0 0


Examples of functions where $f(ab)=f(a)+f(b)$

What are some examples of continuous (on a certain interval) real or complex functions where $f(ab)=f(a)+f(b)$ (like $\ln x$?)


salesforce deployment from Git with Docker cloud

I need way to deploy code from Git to salesforce using Docker Cloud or Docker. I needed senior's suggestions and sources on deployment from Git to to salesforce especially with  and i found way to do it with BitBucket  but didn't find with Git or at least is it possible at the current moment with docker?.


Can I prevent others from editing my question?

edited my question,  where I specifically said that our software sending back stacktrace to one of our servers was a user-known public feature.  He then modified the title of my post, along with the entire content, making it sound like I snuck in the feature and that our application was phoning home without our users knowing.    I specifically wrote in the original post that the feature was not sneaky. He completely changed the meaning of my post. I find this to be rather unacceptable.  A few questions:   Is it possible to prevent editing of my posts? How can I retaliate? Can I file a complaint?   Can people with  do anything they want on Stack Overflow?


Why is form api ignoring the weight that i'm giving to the action buttons? (node edit page)

So, I've implemented hook_form_alter in a custom module. I have added a button to the node edit form of a specific content type.   However, I can't for the life of me get the new button to display with the standard buttons ie save & preview. It just appears at the top of the page, regardless of the figure that i put in as the weight (I tried 100000000000000)...  Fingers crossed that this is just a 'newbie' oversight :)  Here is the code that I'm using:  function MYMODULE_form_alter(&$form, $form_state, $form_id) {   if($form_id == 'CONTENTTYPE_node_form') {     // Add validation for a file         $form['field_CUSTOMFILE'][0]['#upload_validators']['custom_file_validation'] = array();      // Add update site button to CONTENTYPE node add/edit form              $form['actions']['update_site'] = array(             '#type' => 'submit',             '#value' => 'Update site',             '#name' => 'op',             '#submit' => array('MYMODULE_form_submit'), /* NEED this */             '#weight' => 99,             );          $form['actions']['submit']['#weight'] = 101;          $form['actions']['preview']['#weight'] = 100;          return $form;    }  }   These lines from above were only added today but made no difference...   $form['actions']['submit']['#weight'] = 101; $form['actions']['preview']['#weight'] = 100;   As always, anyway pointers would be very much appreciated :)  Edit:   This question was not answered in the indicated "This question has already a answer" link above... That link explains Drupal 7 specific code, although the post isn't tagged as such... This post was specific to Drupal 6 as tagged... In fact the code in this post didn't work for me because it was using Drupal 7 code :)


Does Ubuntu (server) go to sleep? Why does it take long to login?

I have several Ubuntu Server (12.04 LTS) virtual machines.  Some are idle and some are processing background tasks, etc.  However, when I try to login (SSH) to the servers, it often takes several seconds but subsequent login (within a short amount of time) are very quick which makes me think the server is going to sleep after a certain amount of idle time.  (This might be my virtual server [ESXi] causing this, but I haven't found anything...)


no Get More in Plugin Manager in qgis 2 + ubuntu 13.04

After upgrade of qgis 1.8 to qgis 2.0 I couldn't find the choice "Get more" in Plugin Manager and I can't install plugins.


Is posting a very long quote OK for an answer?

I just found  to a question on SO. While it provides a source for the (very long) quote, I do not like the fact that the answerer just posted the quote, without adding anything. Maybe add highlights/emphasis or remove uninteresting passages. Or skip the quote altogether and write a short summary. I feel, in the current form, this should have been a comment that just links to the original article.  Am I too pedantic? Should I flag this as not an answer? Should I downvote it? What do you think about such answers?


Why does apache2 have multiple processes?

This is the command ps -A |grep -i apache2 output:  xxxx@debian:~$ ps -A |grep -i apache2  2362 ?        00:00:01 apache2  2365 ?        00:00:00 apache2  2367 ?        00:00:00 apache2  2369 ?        00:00:00 apache2   Which is the correct pid when i use killcommand ?


I have a laptop running Ubuntu 14.04, but I'm having WiFi connectivity issues. When I switch on the laptop, it can connect to WiFi with no problems, but after some time that the WiFi was on (connected or disconnected), the WiFi stops working. It shows that it is connected, but the internet connection doesn't work. If I disconnect and try to reconnect, it won't connect again to any WiFi (but Ethernet always works). I've tried to put it on airplane mode, disabling WiFi, killing wifi-manager, using a USB wireless adapter, but nothing short of rebooting works to get the WiFi back up.  I presume that the reason it works is because rebooting causes a specific service or program that is causing the issue to restart.  My question is, does anyone know how I can restart that WiFi connectivity service that is causing the issue without having to restart the whole computer?  EDIT:  The outputs of lspci -knn | grep Net -A3 are:  02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]     Subsystem: Lenovo Device [17aa:b736]     Kernel driver in use: rtl8723be


how can I get rid of the extra tablet features windows 7

I have a pen-tablet, and under XP it simply connected and worked in apps.  now in windows 7, it starts up 4+ extra programs to adapt to being used as a tablet PC- except that the computer is not a tablet PC,it's a desktop with a basic tablet plugged into it. is it possible to make windows stop loading up all these extra features when they are not needed?


In the US, turkeys labelled "fresh" . The idea, as I've understood it, is that fresh turkeys aren't supposed to be frozen.  Well, one that I bought last year was definitely frozen in the middle. And yesterday, I was shopping for a thanksgiving turkey and all of the ones labelled "fresh" were suspiciously firm to the touch.  My question is, Will a turkey held at 26F freeze? Or at least become what a person might think of as frozen?


How can I increase the $R^2$ -value of my linear model? Should I increase it?

I'm constructing a linear model from a data set with 10 variables and my current "best" model uses 4 variables. I've tested the variables and not all of them show significance, so the most that I might add to the model might be 5 variables overall. However, with 4 and 5 variables, eventhough I get very good Pr(>|t|) values for all the variables that I've added and while my $R^2$ value has been improving, it's still just "only" $0.4287$ and the scale is $[0,1]$.  Should I be happy with $< 0.5$ $R^2$ value of should I aim to improve it in order to improve my model even more? What can I do to increase the $R^2$ value now that I have already added all variables that I can add as predictors? Should I look into interaction terms? Or something else?


How do the Warlock spell slots and slot levels work?

The Warlock list confuses me. It says that you have spell slots but not the spell slot level and at level 20 you only get 4 spell slots? Is this right? Also it says slot level. I'm guessing that's for what level of spell you can pick at that level. Am I correct with that as well?


Expected number I will be on after drawing cards until I get an ace, 2, 3, and so forth

I am having some trouble solving the following.  You draw cards from a standard 52-card deck without replacement until you get an ace. You draw from what is remaining until you get a 2. You continue on with 3. What is the expected number you will be on after the entire deck runs out?  It was natural to let   $T_i = \text{first position of card whose value is }i$ $U_i = \text{last position of card whose value is }i$   So the problem essentially amounts to figuring out the probability that you will be on $k$ when the deck runs out, namely:  $$Pr(T_1<\cdots<T_k \cap U_{k+1} < T_k)$$  I can see that  $$Pr(T_1<\cdots<T_k) = 1/k!  \\  \text{and}  \\ Pr(U_{k+1} < T_k) = 1/70$$  but could not get any further...


How to use win explorer to create folders for Bash on Ubuntu on Windows?

How can I use the Windows Explorer to create folders or files in my home directory using "Bash on Ubuntu on Windows"?  I tried the following:   Enter C:\Users{user}\AppData\Local\lxss{username} in the Windows Explorer Create a folder named "scripts" using Windows Explorer Open Bash on Ubuntu on Windows Run ls -a   RESULT: total 0  Are there any plans to make something like this work?  P.S. Workaround-ish:   I used mkdir & touch in bash to create folders & files e.g. scripts/menu.py I used the Windows Explorer & Notepad++ to edit menu.py I ran the script with python scripts/menu.py


Client-side detection of HTTP request method

Is it possible to detect the HTTP request method (e.g. GET or POST) of a page from JavaScript?  If so, how?


How to securely erase hard drive with ubuntu live cd?

I want to sell my old SSD on EBay. How do I prepare the hard drive to protect my personal data and get the hard drive in a good shape using an Ubuntu live cd?


Restore application data after renaming account folder

I recently renamed my macOS account, but rather than renaming the folder, macOS has created a new folder in /Users. The OS won't let me copy ~/Library in its entirety, so I'm n,ow just copying application support files when I run into issues with an application, but is there an automated way to do this? This must be an issue others have faced before.


How to know the source of Ubuntu 64 or 32 bit?

I have an Ubuntu source on a flash stick and I want to know any way that let's me to know the following with out need to run it. The test computer is Windows 7:  1- the version of Ubuntu. 2- 64 bit or 32 bit.


Steam no longer recognizing games in drive F

I installed games onto another internal drive, and since yesterday steam seems to have forgotten that games are installed on that drive, I don't want to download all the games again, help?


I'm currently studying Undergraduate level - III, and I have a course of Elementary Metric Spaces, basically for a starter level. Now, for better concepts, I need a good book. One of my friends in my class suggested the book of Topology by J. Munkres, but there is just a small part of it. Please suggest me some books completely dealing with metric spaces.   Thanks in advance !!


Give less reputation on answers when question is marked as duplicate

We always come across questions that are duplicate. If a question already has comment that it is possible duplicate. Then, I always check if that is the correct duplicate and if yes, I flag it as duplicate. But I also see people posting same answers as earlier.  Those answers get upvotes and reputation, even though same answers are already posted in the other questions.  I suggest that after the question is marked duplicate (e.g. after second or third vote while question is still open) answers posted on that question will give less reputation to their author when voted up, e.g. 5 points instead of 10.


I have had my webpages in diferents hostings, and in all this hosting it was working fine, a few days a go, I bought one hosting in godaddy, I made the backup of the database, and then I put it in the hosting of godaddy, but I have a problem, when I am trying to put de data of my query into an array to convert it in a json, it didnt show something. in the other hosting and localhost it is working fine.  $sql1 = "SELECT * FROM table Where somthing='$something'"; $ejecutar_sql1=mysqli_query($con,$sql1);  if (mysqli_num_rows($ejecutar_sql1) > 0){     $rawdata = array();      $i=0;     while($row = mysqli_fetch_array($ejecutar_sql1))     {         $rawdata[$i] = $row;         $i++;     }     echo json_encode($rawdata); }    If I put echo mysqli_num_rows($ejecutar_sql1); its show me 270.  If I put echo $row["id"]; inside the while, it show me all the id.  If I put echo count($rawdata); its show me 270.  But the echo json_encode($rawdata); it didnt show something.   thanks for the help


I'm writing a report using the IFAC style, but when making some sections and putting some images inside in the following way:   \section{Section 1}      \subsection{Subsection 1}      One thing and other    \begin{figure}[H]    \begin{center}    \includegraphics[width=8.4cm]{file1.png}     \caption{caption }     \label{fig:LM741}    \end{center}    \end{figure}   \subsection{Subsection 2}    after compiling it to PDF, instead of the images inside each subsection, it gets the list of sections/subsection and the whole bunch of images at the end. How to correct this?  P.S.: I have tried using sections and subsection.


do while loop syntax error, program not going through all of code, code efficiecy

I made a basic number guessing game, everything was working fine until i tried to add a "play again" feature at the end of it. When the program is run, after inputting the first guess, it just starts the loop over again without going through the rest of it. Also, I am unsure if my code is efficient or not. It seems like too much coding for a simple concept. Is this an average length for a basic guessing program? Sorry if my questions are worded strangely. I'm a first year college student just learning the basics of programming. Here is my code:  public static void main(String[] args) {     Scanner input = new Scanner(System.in);     Random randomNum = new Random();      boolean playing = true;     do {         int max = 100;         int min = 1;         int counter = 10;         int guess = 0;          int guessThis = min + randomNum.nextInt(max);         System.out.println("I'm thinking of a number between 1 and 100. You have 10 tries to guess it. What's your first guess?");          guess = input.nextInt();         counter--;          if (guess == guessThis) {             playing = false;         } else {             playing = true;         }         if (guess > max) {             System.out.println("I said the number is between 1 and 100. You think this is a GAME MUTHA FUCKA??! Guess again... :) " + counter + " guesses left.");           }         if (min > guess) {             System.out.println("Bruh. Are you stupid? " + guess + " is not between 1 and 100. Try again dummy boi. " + counter + " guesses left.");         }            if (guess > guessThis && min <= guess && guess >= max && playing == true && counter > 0) {             System.out.println("Too high. Guess again. " + counter + " guesses left.");         } else if (guess < guessThis && min <= guess && guess >= max && playing == true && counter >0) {             System.out.println("Too low. Guess again. " + counter + " guesses left.");           }          if (playing == false && counter > 0) {             System.out.println("You guessed it!");         }         if (counter <= 0) {             System.out.println("You lose! Ha! Fuck off broooooo. My number was " + guessThis);             playing = false;         }          }while (playing == true);      String answer;      if (playing == false) {         System.out.println("Wanna play again? (y/n)");     }     answer = input.next();     if (answer == "n") {         System.out.println("My game isn't fun enough for you? Wow, okay, rude. Bye then. Dh.");         input.close();     } if (answer == "y") {         playing = true;     } }   }


Title of a 1970s Sci-Fi tv show or tv movie featuring a character with a sort of psychic "tuning fork" that could turn thought into energy?

Plot Details/Summary Another one of my "long shot specials", I'm afraid. The show was some sort of sci-fi adventure set on Earth or an Earth-like planet.  There is a mixed group of survivors/adventurers who are brought together somehow and all put into the situation they are in. I believe all of the characters are humans and from Earth. The one thing I can really remember from the show is that one of the characters had a wand-like device that had a clear glass or plastic "tuning fork" on the end of it.  The character could focus his thoughts or will through the device, which would glow and do things like shatter glass, etc. That's about all I can recall.  I don't know if it was only a tv pilot, or if it went to series.  It was definitely an American or Canadian produced show (i.e. it was not British) and I'm almost certain it was broadcast by one of the major tv networks. Timeframe Mid-to-late 1970s.  I think it was probably later in the 70s, though I'm not certain of that.


How to reduce the space around a table spanning two columns


Invalid postback or callback argument.  Event validation is enabled using ''

I am getting the following error when I post back a page from the client-side. I have JavaScript code that modifies an asp:ListBox on the client side.  How do we fix this?  Error details below:  Server Error in '/XXX' Application.  -------------------------------------------------------------------------------- Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.  Exception Details: System.ArgumentException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.  Source Error:  An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  Stack Trace:  [ArgumentException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.]    System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +2132728    System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +108    System.Web.UI.WebControls.ListBox.LoadPostData(String postDataKey, NameValueCollection postCollection) +274    System.Web.UI.WebControls.ListBox.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +11    System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +353    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1194  -------------------------------------------------------------------------------- Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433


Colon vs. Semicolon? "Lydia's father is a master chef;/: he oversees the kitchen at a five-star restaurant."

From Grammar Workshop: "Lydia's father is a master chef he oversees the kitchen at a five-star restaurant."   Can someone explain whether to use a semicolon or a colon?


Don't offer the "edit" option for comments after the 5 minute window in the android app

The Android app shouldn't offer the "edit" option for comments after the 5 minute window.  Currently, the app will give you the menu, allow you to click through and edit it, only to give you a "write_failed" error after submitting. For non-mods, who have a five-minute edit window, it makes no sense to offer the option in the first place.  Edit: Additionally, if you try to discard the edit, the app crashes.  Update:


I recently flag  as Low Quality since it is only a link. Later on, the flag went disputed without editing on the answer (I don't know why).  Then I cannot flag the question again, so I flagged it for "Other", like I readed is something I can do, in some posts here on meta.  The flag was declined:      flags should only be used to make moderators aware of content that requires their intervention   Maybe I should't flag on "Other"? I still think the question is low-quality. What is the way to proceed?


Does an index where the last column is unique and already indexed make sense?

I found a unique index on (RetailerID, ID) in our database.  The ID column is the primary key so it's already uniquely indexed.  I can't see how an index on (RetailerID, ID) could help when looking up an individual record by RetailerID and ID (or just ID).  I suspect it might be helpful when querying all the IDs under a particular RetailerID, since it covers such a query.  Is that true?  But then why not just make the index on RetailerID include ID?  Perhaps the unique index on (RetailerID, ID) covers the query in the same way but performs better as a result of being a unique index.    As I said, there's a unique primary clustering key on ID alone.  There's also a unique index on (RetailerID, ID). Since ID is already unique, querying where RetailerID = x and ID = y shouldn't be any more efficient than simply querying where ID = y.  (ID) is unique and (RetailerID, ID) is unique, so ID is associated with at most one RetailerID.  Therefore, if a predicate has ID, then including RetailerID in the predicate is redundant.  The clustered index would always be faster.  An index on (RetailerID, ID) could be helpful for a query where the predicate is just on RetailerID and the select is on just ID, because it would cover the query, but for queries where ID is in the predicate, RetailerID in the predicate is redundant, and since it has no other included columns, it would be less-efficient than the clustered index when selecting any column other than ID.  That's why I'm not seeing the point of this index, given the predicates used (which always involve ID).


Difference between the limit of function and continuous function

What's the difference between two concepts,  1. limit of function and 2. continuous function? I looked at their definitions in the textbook written by Rudin and it's so hard to differentiate between them.  They look similar to me.  [Edited]  I can't find the difference between two definition. If they are the same, it means that a function is continous if and only if every point is a limit point. But this is not true. So I want to know what makes a difference between a point being a limit of function and function being itself continuous  Images of Definitions


Twitter now has an 'activity' tab where the 'retweets' tab used to be. How can I find out which of my tweets have been retweeted, and by whom?


How long is yogurt good after the best by date?

I have a large, unopened container of yogurt that is a couple weeks past the best by date and I wondering if it is safe to eat. It still smells fine. How long past the best by date is yogurt usually still good?


Active Question lists - Name should reflect original poster (and editor if exists)

I find it odd that in the list of Active Questions, the name of the person is the last one who replied/edited/commented on the question. However when you open the question, you see the real author + last editor:    However, the very same question in the “list” looks like this:    This is awful, because it gives the reader the impresion that I wrote that question, which in this case belongs to Mr. Sam Day.   As someone who has editing permission on the site, I am constantly fixing small typos and formatting errors, but this makes my name appear in the front page all the time. (note: the site is apple.se, but I’m sure this is the same for others).  update: Let me put it in another way. I go to apple.se.com and I see this:    In both cases it looks like I asked the questions mainly because the second one doesn’t have any answer yet has a “name”.   In my opinion, it’s not clear and it should say or show both names.


Does Stack Overflow publish OS/browser usage usage stats?

I'm interested in seeing which OSes and browsers developers use and I'm sure Stack Overflow has some interesting data. Has any ever been released anywhere?


The answers to  include Elladan and Elrohir as twins. Is there any cannon sources backing this up? Wikia is a dreadful source for Tolkien canon, is it stated anywhere that the sons of Elrond are twin brothers?


I am studying differential equations right now and I am confused the way $dx$ is being used.  When I learnt calculus I thought that $\frac{df}{dx}$ is just symbolic representation of derivative and we can't use it as a fraction. But when it comes to differential equation like $y = \frac{df}{dx}$ they do the following:  $$ydx = df$$  $$\int ydx = f$$  And then again I was taught that $dx$ in integral has no meaning but only convenient way to represent integral.  I am totally fine with the intuition why they do that, I can imagine $\frac{df}{dx}$ meaning small change in $f$ divided by small change in $x$ and integral meaning sum of recatngles of width $dx$ and height $f$, but what I lack is rigorous transition from $\frac{df}{dx}$ meaning just a symbolic representation of derivative to the state where we can algebraically manipulate it as a fraction. Could you please help me with that or suggest some reading?  Also, could you please recommend me some books on differential equations that teach intuition behind the equations?


Let $f: [0,2] \rightarrow \mathbb{R}_{+}^{\ast}$ be a continuous function such that $\int_ {0}^{1} f(t) dt = \int_ {1}^{2}  f(t) dt = 1$. Prove that there is a function $g: [0,1] \rightarrow [1,2]$ of class $C^{1}$, such that $\int_{x}^{g(x)} f(t) dt=1$. Can anybody help me? Can I conclude that the function is periodic? or symmetrical in the range $[0,1]$ and $[1,2]$. What can I get out of it?


Does 'which' refer to the noun immediately preceding it?

Is the 'which' in      Proposition 25 suggests a better definition of m-reducibility than given in Definition 23, which is also the one typically given in texts   ambiguous? It is a line from an article I've written, and the anonymous referee claims that      the reader has to guess to which of the two definitions the "which" at the beginning of the line refers.   It seems to me, however, that the which should refer to the definition immediately preceding it, since if I'd wanted it to refer to the other, I'd have written something like     Proposition 25 suggests a better definition of m-reducibility, which is also the one typically given in texts, than given in Definition 23.   As the title indicates, this is essentially a question about whether 'which' by default refers to the noun closest to it.


Is there any way to install multiple software at a single command via terminal?

I just want to know after install  ubuntu newly it`s  need to install previous essential software again,That is really time consuming so is there any way that I write command and my essential software download and install automatically.


Prove that the function $f(x)=\frac{x}{x^2+1}$ is continuous at $x=-1$.

Prove  that the function $\displaystyle f(x)=\frac{x}{x^2+1}$ is continuous at $x=-1$. You should give a proof that is directly based on the  definition of continuity.   I saw many similar questions on this website, but none of them gave me a satisfactory answer. I more or less understand how epsilon-delta proofs work but my problem lies more in the algebraic manipulations probably. So here's my "attempt".  Definition of continuity; for $f:A \to \mathbb{R}$     $$\forall \varepsilon >0 \ \exists\delta>0\ \forall x \forall x_0 \in A:|x-x_0|<\delta \Rightarrow |f(x)-f(x_0)|<\varepsilon$$   So from what I understand, the procedure for epsilon-delta proofs are as follows: 1. Plug the point of interest $x_0$ into $|f(x)-f(x_0)|<\varepsilon$ 2. Write $x$ in terms of $\varepsilon$ 3. Then plug $x$ into $|x-x_0|<\delta$ 4. Find $\delta$ in terms of $\varepsilon$. Done    At step 1, we have $\left|\dfrac{x}{x^2+1}+\dfrac{1}{2}\right|<\varepsilon$. Step 2 is where I'm stuck because of the 2nd degree polynomial in the denominator. First, I did this: $\left|\dfrac{x}{x^2+1}\right|<\left|\dfrac{x}{x^2+1}+\dfrac{1}{2}\right|<\varepsilon$. Then, I wasn't too sure about what to do, I thought about getting rid of the "$1$", but that would screw up my inequality. I thought about factoring $x^2+1$, but it doesn't have any real roots. I tried inverting the fraction, but that led me to nowhere. And I've already exhausted the tools I have. How do I proceed?  Apparently, epsilon-delta proofs are the most basic building blocks of analysis. And I'm already failing, this is both embarrassing and depressing...


I am using math.round() to round off.   this is the code:  double value=0.145 Math.round( value* 100.0) / 100.0;    My expectation is it should return 0.15 but it is returning 0.14.  Also, if the value is 0.055, then it is returning 0.05 instead of 0.06 I have already gone through the link  Please tell me specific that why this is happening?  Thanks in Advance.


Java Regex for international phone number

Please assist, I need a regex that can validate +27 11 123 4567 . The regex pattern I have currently is :   if(phoneNo.matches("\\+d{3}[-\\.\\s]\\d{2}[-\\.\\s]\\d{3}[-\\.\\s]\\d{4}")) return true;


Stack Overflow's new image uploader does not work on Mac Safari Version 12.0.1 (12606.2.104.1.2). I cannot drag and drop nor select from a list. It works fine using Firefox, Chrome and Opera. This just started today 10/31/2018 when I notice that there is a new interface for the image upload using IMGUR.  Please look into this and fix for Safari if possible or revert back to the old interface.


Did Luke attempt to retake the Jedi Temple on Coruscant?

After the New Republic gains control of Coruscant through the Galactic Concordance, did Luke Skywalker attempt to reclaim (or even visit) the former and still very much intact Jedi Temple, now converted to be the deceased Emperor's palace?   If Luke is so insistent on saving a tree just because it belongs to the Jedi and the Empire stole it, then shouldn't reclaiming the Jedi Temple be even higher priority?  If he did, is he aware of the Sith shrine beneath it? Which is something even Yoda does not know. And if he didn't, why didn't he?


Is 2hr 25min sufficient for switching from an international flight (EWR Terminal B) to a domestic flight (EWR Terminal C)?

I will be arriving by BA at Terminal B of EWR at 14:05 from India (the flight stops at Heathrow). I will then have to go to Terminal C of EWR for my United flight that leaves at 16:30 to Syracuse. I would like to know if the following itinerary could be followed:   Arrive at 14:05. Immigration and baggage taken by 15:30 (SUPER MAX). Take AirTrain from Terminal B of EWR to Terminal C of EWR (10 minutes, i.e. I'll be there by 15:45 maximum). At Terminal C, check into flight to Syracuse by 16:00. Flight to Syracuse leaves at 16:30.   Would I need more time at the Immigration counters or while collecting my baggage?   Finally, would I be able to reach Terminal C on time for my next flight and be able to go through Security and complete the other measures on time?


Why utilize using() when instantiating a class?

I have been working with C# ASP.NET MVC5 for a while and I was wondering something. Why are we utilizing the using() to instantiate a class sometimes?  For an example:  using (CyrptoStream cs = new CryptoStream(PARAMETERS) { //SOMETHING }    or  using (Aes encryptor = Aes.Create() {  }   How is that different to MyClass myClass = new MyClass()  Thank you.


Stock market fluctuations and when to sell out

I recently bought a medical marijuana stock at its lowest point.  It  is estimated that it will reach a high price by 2023.   How can I know for sure when to sell out?


How to assign a keyboard shortcut for a mesh selection mode?

I want a keyboard shortcut for switching between selecting things; vertices, faces and points. One key for each, not a pop up menu where i have to select with the mouse. Does this exist? Modelling should be like playing a piano or something, a key for everything, minimal aiming the mouse pointer att small icons, this aiming the mouse att small icons all the time is so.. breaks the flow.. Im sure it exists but i cant find it anywhere?


Is there a TeX command that returns the width of a given text as length value, so that I can use the result directly as a length argument of another command?  I mean, I would like to have a command \getWidth{my text} and want to use the result directly as the first argument of \parbox:  \parbox{\getWidth{my text}}{my foo\\bar text}


ZSH mapfile, how can I get the bash behaviour?

Both bash and zsh support reading a file into an array, I'm used to the bash's way and am appalled by the zsh's behaviour: zsh starts the array from index 1!  That's not the unix way.  Here is an example, let's create a file:  echo yay1 >> pp echo yay2 >> pp echo yay3 >> pp   And use the bash mapfile (-t prevents the newlines to be sucked into the array elements):  [~]$ mapfile -t arr < pp [~]$ echo "${arr[0]}" yay1 [~]$ echo "${arr[1]}" yay2 [~]$ echo "${arr[2]}" yay3   Cool, that's what I'm used to.  Now let's try zsh (we need to load the module):  % zmodload zsh/mapfile                      % arr=("${(f@)mapfile[pp]}") % echo "${arr[0]}"            % echo "${arr[1]}" yay1 % echo "${arr[2]}" yay2 % echo "${arr[3]}" yay3   Ooops, that's not the unix way of indexing things.  How can I make the zsh's mapfile to start the array from index 0?


I have some plan to travel to Ireland. I have currently working in Netherland. I am non-eu citizen but have Netherland identity card and was wondering if I need to apply for visa to visit Ireland for a few days.


Proving an equality using Euler Totient function

$ϕ(m · n) = \frac{ϕ(m) · ϕ(n) · gcd(m, n)}{ϕ(gcd(m, n))}$ Deduce from the previous identity that $ϕ(n^k) = n^{k−1}· ϕ(n)$  I know that \begin{eqnarray*} \phi(m) = m \prod_{p \mid m } (1-\frac{1}{p}).  \\ \end{eqnarray*} How can I make use of that? Any help please?


100 blue-eyed islanders puzzle: 3 questions

I read the Blue Eyes puzzle , and the  which I find quite interesting. My questions:   What is the quantified piece of information that the Guru provides that each person did not already have?   Each person knows, from the beginning, no fewer than 99 blue-eyed people to be on the island. Then how is considering the 1 and 2-person cases relevant, if each person can dismiss these 2 cases immediately as possibilities?   Why must they wait 99 nights if, on the first 98 or so of these nights, they're simply verifying something that they already know?   EDIT: Most answers seem to concentrate on question 1 which I understand partly: but I remain confused because of different answers.  Can someone answer questions 2 and 3?


i've been trying to mount an .iso according to a guide i read here, but every time i run the command sudo mount -o loop /home/varbo/Downlaods/Windows 7 Ultimate SP1.iso /media/iso i get the same (usage) error:  Usage: mount -V                 : print version  ... usage and options deleted ....  Other options: [-nfFrsvw] [-o options] [-p passwdfd]. For many more details, say  man 8 mount .   Any kind of help would be appreciated.


How to find which graphic card is there on my laptop?

I bought new laptop, in specs they had given nvidia GT 740m.  How can I confirm whether this is correct or not? How can I see which graphic card is installed?


How Can i Make Random Array Item The Same Each Time The Function is Executed

This is the code that I tried:   When the variable result is returned it's not the same, for example if I executed random_Card() two times I got 'red' and in the second execution I got 'yellow' but I want it to be the same no matter how many times I execute that function. Thanks.


Is every compact set is closed in any topological space?

Is every compact set is closed in any topological space ?  My attempt: I can say in usual topologies that every compact set is closed  but I'm confused in other topologies.


How do I make a cd command take effect outside of the bash script subshell?

I made this script:  #!/bin/bash  if [[ $# -ne 1 ]]; then   echo "only use one argument"   exit 1 fi  mkdir $1 sleep 0.5 cd $1  exit 0   I wanted to make a script that I would later put into /usr/bin, such that whenever I write crdir asd it creates the directory and automatically changes my current directory to the new directory.  This way doesn't work, because the schell script is apparently a subshell, and the cd command will not take effect outside of the subshell, so how would I do this?  I read online that I should "source" it, run it with a dot in front, like . ./crdir asd, but first of all, when I tried this, ssh got disconnected from the machine, and secondly, this wouldn't work the way I wanted it to work, as a command.  Any tips?  EDIT: I also tried mkdir aaa; cd !# but it didn't work, it took !# as the argument from the previous command.


SHMUP: who's in charge of collision detection?

Simple design question here:  In a Shoot'Em Up, where you often have to deal with hundreds of bullets / missiles / weird flying stuff, who's in charge of detecting collisions? The weapon or the ship?  As there is usualy less ships than bullets displayed on screen, I tend to believe that would be smarter if ships could be in charge of it. But is it really smarter?


Finding appropriate journal for submitting a modest paper in mathematics

I've finished master studies in mathematics. Now I'm working on some papers, but I'm not so familiar with journals. I've submitted papers in some journals with impact factor, but it was rejected, while some other journals accept them (I doubt they accept anything for money). My question is: how can I find an appropriate journal for a modest paper?


Installing Ubuntu on one of two hard drives

I have two hard drives. One is used for Windows and one is empty. I want to install Ubuntu on the empty hard drive. The Windows hard drive is disk0 in Windows and the empty hard drive is disk1. When I install Ubuntu and it asks where I want to install it, I choose "Something Else" but I am stuck there. What do I choose for "boot loader installation"?