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MathGroup Archive 2007

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Re: Improper Integral & Mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80602] Re: [mg80577] Improper Integral & Mathematica
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Sun, 26 Aug 2007 23:11:41 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200708260711.DAA04031@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

Did you remember to use E rather than e to denote the base of natural 
logs?  (Or to use Esc ee Esc for a symbol that means E.  If you don't 
know about the distinction between E and e, then you had better read the 
basic documentation about Mathematica.

Better yet, use Exp[x] and Exp[2x].

Mathematica then will give you the value without any further work on 
your part.

expizzaiolo at gmail.com wrote:
> Hi all !   :-)
> 
> how to solve:
> 
> Integrate[(e^x) / (1 + e^(2x)), {x, - Infinity, + Infinity }]
> 
> using Mathematica? I'm trying "e^x = t" but won't work...
> 
> 
> 
> TNX!
> 
> 

-- 
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



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