Number of surjective functions from $[k]$ to $[n]$
Number of surjections from $\{1,...,m\}$ to $\{1,...,n\}$
After a very long time will we see more stars (due to the fact that more light is get to us) or less stars (as the universe expends and light have to pass larger distance)? In general, can stellar objects go outside of the scope of the observable universe or is it only growing with time? Calculations are always better than just discussion. Does it have any connection to dark matter? How to create a Wi-Fi Hotspot (in Access Point mode)? Why are imported PDFs blurry in InDesign? Is there a way to disable certain Windows 7 keyboard shortcuts?  Specifically, in this case, I want to disable Alt+Space and WinKey+Space. How to restrict users on changing their wallpapers? I don't want my users to change the system wallpaper. How do I the lock the wallpaper down? Update  Users are changing wallpaper by right clicking the picture and choosing set as wallpaper. How to restrict this behaviour?  Is it possible to remove Backgrounds Tab from Appearance Preferences? If yes how? Why is the ##UserID## parameter not populated in Data Explorer anymore? Environment I'm logging in using the OpenID from  and using Chrome 31.0.1650.57 m if that matters. Steps to reproduce: Log in to  and , for example, like: DECLARE @MyUserID INT = ##UserID:int##  SELECT TOP 1     Id AS [Post Link],     Score AS [Score],     CreationDate AS [Creation Date] FROM     Posts WHERE     OwnerUserId = @MyUserID AND     PostTypeId IN (2, 3) ORDER BY     CreationDate DESC  Then press the Run Query button and see if the UserID field is filled with your own user ID like shown in the below screenshot:  Question: Did something changed on the ##UserID## parameter (for example, that it's not supported anymore)?  If so, then there is an outdated  paragraph about it (What's the point of logging in). If not, it is a bug which is there about three days (I've been waiting since I noticed that you were going to do some changes to Data Explorer, but it remains there, hence my question). Why is unity feedback used? Why is the unity feedback system used? This block diagram is for a 2 DOF ball balancing using a PID controller. Passing arguments forward to another javascript function What is the simplest and most robust way to get the user's current location on Android? Product of Non-Disjoint Cycles I am trying to learn how to find the product of non-disjoint cycles, as you may have guessed from the title. I have the basic idea, but I do not understand it entirely.  I am trying to find $(1352)(256)$ and $(1634)(1352)$, multiplying from right to left.  Please give me some hints/suggestions.  Thank you. Does installing and using Wine open up your Linux platform to Windows viruses? When I was at school and learning integration in maths class at A Level my teacher wrote things like this on the board.  $$\int f(x)\, dx$$  When he came to explain the meaning of the $dx$, he told us "think of it as a full stop".  For whatever reason I did not raise my hand and question him about it.  But I have always shaken my head at such a poor explanation for putting a $dx$ at the end of integration equations such as these.  To this day I do not know the purpose of the $dx$.  Can someone explain this to me without resorting to grammatical metaphors? Are there any differences between URLs with and without "www" and "http://" Are there any differences among these addresses?     www.example.com http://www.example.com example.com I've used a number of different *nix-based systems of the years, and it seems like every flavor of Bash I use has a different algorithm for deciding which startup scripts to run.  For the purposes of tasks like setting up environment variables and aliases and printing startup messages (e.g. MOTDs), which startup script is the appropriate place to do these?  What's the difference between putting things in .bashrc, .bash_profile, and .environment?  I've also seen other files such as .login, .bash_login, and .profile; are these ever relevant?  What are the differences in which ones get run when logging in physically, logging in remotely via ssh, and opening a new terminal window?  Are there any significant differences across platforms (including Mac OS X (and its Terminal.app) and Cygwin Bash)? If $f$ is integrable then $|f|$ is also integrable Show that if $f$ is integrable on $[a, b]$ then $\lvert f \rvert$ is also integrable. Hint: Show that $$U (P , \lvert f \rvert) − L(P , \lvert f \rvert) ≤ U (P , f ) − L(P , f ).$$ I have: $$U (P , \lvert f \rvert) \ge U (P , f )$$ and $$ L(P , \lvert f \rvert) \ge L(P,f)$$ Thus, $$U (P , \lvert f \rvert) − L(P , \lvert f \rvert) ≤ U (P , f ) − L(P , f ).$$ Does "the same number of people" behave as singular or plural? Separate long math text under sum symbol into different lines? Disable Hyperlink on a SharePoint 2013 page I want to disable the hyperlink for a specific class part of Site Feeds in SharePoint 2013.  I`m using Jquery to do the same, but it is not working for me. Code for reference  &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.3/jquery.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt;     var location= $('.ms-microfeed-userName ms-textLarge ms-subtleLink').attr("href");  $(".ms-microfeed-userName ms-textLarge ms-subtleLink").removeAttr('href');  $('ul').addClass('expanded');  $('ul.expanded').fadeIn(300);  $(".ms-microfeed-userName ms-textLarge ms-subtleLink").attr("href", location);    &lt;/script&gt; I've been working with Corel Draw previously and now i use Illustrator more.Still getting used to some of their features though. I want to insert an image into a circle I've drawn but i don't know how to go about it.It is called power clipping in Corel. Any answers would be appreciated. Can you eradicate a disease without finding a Cure first? If you eradicate a disease in Pandemic without finding a cure first (ie remove all of one colour from the board) does it remain eradicated or can it still come back unless it has also been cured?  The rules are a bit unclear on this point ... Or I missed the rule that explicitly states this.