Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2007
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Improper Integral & Mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80594] Re: Improper Integral & Mathematica
  • From: "David W.Cantrell" <DWCantrell at sigmaxi.net>
  • Date: Sun, 26 Aug 2007 23:07:31 -0400 (EDT)
  • References: <faraa2$4k6$1@smc.vnet.net>

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...

Just use the constant E, which is what I suppose you intended, rather than
the variable e:

In[3]:= Integrate[(E^x) / (1 + E^(2x)), {x, - Infinity, + Infinity }]

Out[3]= Pi/2

David


  • Prev by Date: Re: Drawing tick labels without ticks
  • Next by Date: Re: Cell brackets on left ?
  • Previous by thread: Re: Improper Integral & Mathematica
  • Next by thread: Re: Improper Integral & Mathematica