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MathGroup Archive 2000

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more wrong integrals

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24492] more wrong integrals
  • From: Gianluca Gorni <gorni at dimi.uniud.it>
  • Date: Thu, 20 Jul 2000 03:01:36 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello!

Here are two integrals in two variables that Mathematica 4 gets wrong:

Integrate[Cos[t]/r, {r, 0, 1}, {t, 0, Pi/2}]  gives  0

Integrate[Cos[t]/r^2, {r, 0, 1}, {t, 0, Pi/2}]  gives   -1

although the functions are >0 in the integration region,
and the integrals diverge.

Regards,

             Gianluca Gorni
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