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Re: Integrate Bug

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100052] Re: Integrate Bug
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Fri, 22 May 2009 01:48:36 -0400 (EDT)
  • References: <gv2jh5$97b$1@smc.vnet.net>

Looks like a bug indeed. Consider contacting Wolfram support.

Cheers -- Sjoerd

On May 21, 5:58 am, Ney Lemke <ney.nle... at gmail.com> wrote:
> I am trying to calculate this integral that should be positive.But the
> answer is 0.
>
> In: Integrate[(1)/(z^2 + b^2 + a^2 - 2 z b Sin[\[Theta]] -
>     2 a b Cos[\[Theta]])^(1/2), {\[Theta], 0, 2 \[Pi]},
>  Assumptions -> {a > 0, b > 0, z > 0}]
>
> Out:0
>
> Anybody have notice a situation like that?
>
> My platform is MacOSX 10.4 and Mathematica 7.
>
> Best wishes,



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