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Re: Integration - another Integer as a result

• To: mathgroup at smc.vnet.net
• Subject: [mg93780] Re: [mg93743] Integration - another Integer as a result
• From: Murray Eisenberg <murray at math.umass.edu>
• Date: Tue, 25 Nov 2008 07:20:06 -0500 (EST)
• Organization: Mathematics & Statistics, Univ. of Mass./Amherst
• References: <200811241144.GAA16308@smc.vnet.net>
• Reply-to: murray at math.umass.edu

Did you try correct Mathematica syntax -- Sin not sin, space between n 
and the Pi symbol?

In Mathematica 7.0:

   Integrate[2 x + Sin[n Pi x/L] Sin[n Pi x/L], x] // InputForm
x/2 + x^2 - (L*Sin[(2*n*Pi*x)/L])/(4*n*Pi)


MikeSw wrote:
> Hello,
> 
> I'm trying to calculate an integer using Mathematica, but instead of getting a "normal" result I get another Integer. The algorithm available on Wolfram website does this calculation with no problem:
> 
> http://img156.imageshack.us/my.php?image=cakaqt6.jpg
> 
> but Mathematica gives this:
> 
> http://img156.imageshack.us/my.php?image=cakamtkmvk9.jpg
> 
> I guess there is something wrong with the input?
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305

• References:
  • Integration - another Integer as a result
    • From: MikeSw <sowasowa@o2.pl>