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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