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MathGroup Archive 2000

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Re: Integrate returns 0

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23935] Re: Integrate returns 0
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 16 Jun 2000 00:57:18 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <8i9pj8$2hq@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

a bug the integral is never zero.

Regards
  Jens
"Felix E. Klee" wrote:
> 
> 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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