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Currently the migration path options from SO are:   Meta.SO Serverfault SuperUser Webmasters Programmers   If we are going to be limited to 5 options, shouldn't we periodically re-evaluate which sites are most appropriate?   (10k only) indicate that the top sites for the last 90 days are:   Superuser - 564 - 5% rejected ServerFault - 278 - 10% rejected Tex - 157 - 13% rejected DBA - 144 - 2% rejected Sharepoint - 127 - 1% rejected Programmers - 126 - 26% rejected CodeReview - 100 - 3% rejected Meta.SO - 81 - 18% rejected Wordpress - 75 - 14% rejected Webmasters - 58 - 8% rejected   All these migrations for sites out of the list required a flag and a moderator to process it.  This is just extra work for the mod team!  If we had the top 5 destinations by volume as the 5 options, we would have had a net savings of 160 flags to be processed.  I suspect we will actually see these numbers change quite a bit if it's easier for users to put questions in the appropriate spot without moderator intervention.  Can we have a review of the migration path list based on migration volume?  Think of the flags! Ubuntu Wifi drivers not working after getting update How much money does Stack Exchange make? How to find out the terminal command of an application? Pass by Reference / Value in C++ Show that $a^n \mid b^n$ implies $a \mid b$ \footnote breaks @-constructs in \index Is a sentence always grammatically incorrect if it has no verb? Is the following grammatically correct? My friend says the second sentence is grammatically incorrect, but couldn't explain why.     I have always been fascinated by statistics. The different ways in   which you could look at data and infer knowledge from it. Detect if a method was overridden using Reflection (C#) Add ability to flag answers as duplicates How to measure the component value on a PCB? I want to kill a whole process tree.  What is the best way to do this using any common scripting languages? I am looking for a simple solution. If $\sum_{n=1}^{\infty} a_n^{2}$ converges, then so does $\sum_{n=1}^{\infty} \frac {a_n}{n}$ Let $a_1,a_2,a_3,\ldots$ be reals. Prove that if $\sum_{n=1}^{\infty} a_n^{2}$ converges, then so does $\sum_{n=1}^{\infty} \frac {a_n}{n}$.   For this I have shown the case for when $ a_n^{2} \le\frac {|a_n|}{n}$ $\Rightarrow$ $ |a_n|\le\frac {1}{n}$ $\Rightarrow$ $\frac {|a_n|}{n} \le \frac{1}{n^{2}}$ and we know that $\sum_{n=1}^{\infty} \frac {1}{n^{2}}$ converges and hence $\sum_{n=1}^{\infty}\frac {a_n}{n}$ converges by the comparison test. Now considering $ a_n^{2} \ge\frac {|a_n|}{n}$ $\Rightarrow$ $\frac {|a_n|}{n} \le a_n^{2}$ $\rightarrow$ combining the two cases for any n we have: $\frac {|a_n|}{n}\le\frac{1}{n^{2}}+a_n^{2}$ Hence using the comparion test again we know that $\sum_{n=1}^{\infty} a_n^{2}$ converges and $\sum_{n=1}^{\infty} \frac {1}{n^{2}}$ converges hence the sum converges so we can conclude that $\sum_{n=1}^{\infty} \frac {a_n}{n}$ is absoluetly convergent $\Rightarrow$ convergent.  Not to sure if this is correct, any help would be much appreciated, many thanks. Which application to preview .md files? Is there an application to preview markdown files (.md files) on OSX (for instance on Maverick)? How does the formation of a solar system not break the second law of thermodynamics? Please forgive: I am a layman when it comes to physics and cosmology, and have tried finding an answer to this that I can understand, with no luck.  As I understand it, the solar system evolved from a massive molecular cloud. To me, this seems to break the second law of thermodynamics, as I think it suggests order from disorder.  I know there must be something wrong with my logic, but am really stuck.  Can anyone explain this one in layman's terms?  (Posting to both "Astronomy" and "Physics", as it seems to overlap these subjects) Convergence of $U_n=\frac{1}{\sqrt{2n\sigma^2}}\left(\Sigma X_j-\Sigma Y_j\right)$ - central limit theorem Suppose that $U_n=\frac{1}{\sqrt{2n\sigma^2}}\left(\Sigma X_j-\Sigma Y_j\right)$,  where $X_1,X_2,\ldots$ and $Y_i,Y_2, \ldots$ are i.i.d. sequences of random variables with mean $\mu$ and variance $\sigma^2$ and the sequences $\{X_i\}$ and $\{Y_i\}$ are independent.  Then, for all real numbers $x$, show that, as $n\to \infty$,  $$\mathbb{P}(U_n\leq x) \to  \int_{-\infty}^{x} \frac{1}{(\sqrt(2\pi))} \:e^{-\frac 12{u^2}}\mathrm du $$ Approach  I tried to carry out the integration on the right, but this does not integrate nicely. It ends up involving an error function, so I figured this was the wrong was to go.  Should I be looking at convergence in probability to answer this question? Is Chebyshev's inequality relevant here? If so, how and how does that relate to the integral? SingleEmailMessage sending isn't working when called from Unit Test I have the following code:      public class OrderRequestCreationEmails {     public static void sendMail()     {          Messaging.reserveSingleEmailCapacity(2);         Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();         String[] toAddresses = new String[] {'dgriff@varonis.com'};           mail.setToAddresses(toAddresses);          mail.setReplyTo('dgriff@varonis.com');          mail.setSenderDisplayName('Mail Test');          mail.setSubject('Success! Mail Sent');          mail.setBccSender(false);         mail.setPlainTextBody('BODY');          Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });     } }   I tried to call this function from a test as such: (I know its not an actual test, its just to see if I receive a mail).  @isTest private class CreationEmailsTest {     @isTest private static void sendMailTest() {         OrderRequestCreationEmails.sendMail();     } }   And I haven't received the mail, no idea why?  It's an example I took from the salesforce developer guide. couldn't find any answers online...  FYI - deliverability in the sandbox is turned on, and test deliverability works How do I display the nth result of an ls command? I used this command to display the first result of files in my directory.    ls | head -n 1   My simple question is, how can I modify this command to display say the nth result?  Thanks! Prove $\lim_{x \rightarrow 0} \frac {\sin(x)}{x} = 1$ with the epsilon-delta definition of limit. Is it possible to add an email just below the authors in this code?  \documentclass[11pt,oneside,a4paper]{article} \usepackage{hyperref}   \title{Hello} \author{User1 \and User2}    \begin{document} \maketitle  \section{Introduction} A1 \section{Literature Review} A2  \section{Conclusion} A2  \end{document}