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Re: Strange results from Mathematica


The Infinity in Mathematics starts with a capital I..so check if thats
the problem.

Cheers,

Raj

On Apr 12, 11:36 pm, "Jung-Tsung Shen" <jus... at gmail.com> wrote:
> Hi, I encountered a rather strange results from Mathematica today.
>
> When evaluating the following integration
>
> (1) Integrate[x (BesselJ[0, x])^2, {x,0, infinity}]
>
> my Mathematica gave the answer 0. That's very weird, since if you plot
> out the function x (BesselJ[0, x])^2, apparently the integral should
> not be zero ...
>
> Moreover, for the following integration
>
> (2) Integrate[ (BesselJ[0, x])^2, {x,0, infinity}]
>
> My Mathematica says it's some finite value. However, once you did
> this, and then did (1), and then came back to do (1), the answer
> became 0 ...
>
> My Mathematica version is 5.0.1.0 on Mac Powerbook.
>
> Thanks.
>
> JT




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