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MathGroup Archive 2005

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Re: Question about an integral

  • To: mathgroup at
  • Subject: [mg54399] Re: Question about an integral
  • From: Peter Pein <petsie at>
  • Date: Sun, 20 Feb 2005 00:07:57 -0500 (EST)
  • References: <cv6ssi$6qb$>
  • Sender: owner-wri-mathgroup at

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.
You must not integrate over the origin. So either the real part of A has 
to be greater than zero or the imaginary part of A must not vanish:

Integrate[1/x^2,{x,2,A},Assumptions-> Re[A]>0 || Im[A]!=0]

Peter Pein

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