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MathGroup Archive 2005

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Re: Question about an integral

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54577] Re: Question about an integral
  • From: dh <dh at metrohm.ch>
  • Date: Wed, 23 Feb 2005 03:11:52 -0500 (EST)
  • References: <cv6ssi$6qb$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

richard speers wrote:

> The previous version of Mathematica integrated  1/x^2 from x=2 to x=A
> very nicely, giving 1/2-1/A.  The new
> version won't do the integral.  Please help.
> 

If A <0 your answer is wrong! The integral does diverge. You are 
assuming that A>2. So simply tell this to Mathematica and you get the 
right answer:
Integrate[1/x^2, {x, 2, A}, Assumptions -> A > 2]  gives: 1/2-1/A

Sincerely, Daniel


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