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Re: Strange results from Mathematica

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



On Apr 12, 11:36 pm, "Jung-Tsung Shen" <jus... at> 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 on Mac Powerbook.
> Thanks.
> JT

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