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MathGroup Archive 2004

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Re: Can this integration be done?

  • To: mathgroup at
  • Subject: [mg50134] Re: Can this integration be done?
  • From: Jens-Peer Kuska <kuska at>
  • Date: Tue, 17 Aug 2004 05:00:54 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <cfk9ub$f69$>
  • Reply-to: kuska at
  • Sender: owner-wri-mathgroup at


try to find out why a=b=c=-1 end up at infinity
and find out what happens when a are somewhere 
the complex plane but not at the negative real axis.

You havt to look for the zeros of the denominator
to speak about the possible solutions of the integral.


Daohua Song wrote:
> Dear Group,
>       I am wondering whether the following integration has an analytic
> expression. Alough i believe so.
>       Integrate[x/((a + x)*(b + (c + x^2)^2)),{0,Infinity}].
>       When i set a=b=c=1,mathematica give me an answer.
>       Any help is appreciated.
> sincerely
> Daohua

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