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Re: Integrate Bug

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100097] Re: Integrate Bug
  • From: lehin.p at gmail.com
  • Date: Sat, 23 May 2009 06:33:27 -0400 (EDT)
  • References: <gv2jh5$97b$1@smc.vnet.net>

On 21 May, 07:58, 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,

Hello,

I confirm this bug on Windows XP SP3 with Mathematica 7.0.1. And I can
add that in version 5.2 this bug is absent (Mathematica 5.2 returns
unevaluated input).


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