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MathGroup Archive 2000

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Integrate returns 0

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23888] Integrate returns 0
  • From: "Felix E. Klee" <felix.klee at inka.de>
  • Date: Thu, 15 Jun 2000 00:51:26 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

when I define the function
    f[x_,n_]:=D[Exp[-x^2],{x,n}]^2
and execute
    Integrate[f[x,n],{x,-Infinity,Infinity}]
the result is
    0

However this is not correct for all parameters n since
    Integrate[f[x,1],{x,-Infinity,Infinity}]
returns
    Sqrt[Pi/2]

Is this a bug in Mathematica or am I doing something wrong?

TIA,

Felix


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