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MathGroup Archive 2005

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Re: Unexpected non-evaluation problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg63145] Re: [mg63124] Unexpected non-evaluation problem
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Thu, 15 Dec 2005 07:14:05 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Very weird behavior.

UnnecessaryFunction[x_]:=
    ToExpression[ToString[InputForm[x]]];

InverseFourierTransform[FourierTransform[x^2,x,y],y,x]//
UnnecessaryFunction

x^2


Bob Hanlon

> 
> From: "Carl Cotner" <carl.cotner at gmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/12/15 Thu AM 03:06:33 EST
> Subject: [mg63145] [mg63124] Unexpected non-evaluation problem
> 
> I am totally baffled by the following Mathematica behavior:
> 
>   In[1]:= InverseFourierTransform[FourierTransform[x^2, x, y], y, x]
>   Out[1]= Sqrt[2 Pi] x^2 FourierTransform[DiracDelta[y], y, x]
> 
>   In[2]:= Sqrt[2 Pi] x^2 FourierTransform[DiracDelta[y], y, x]
>   Out[2]= x^2
> 
> I've already asked my local guru without success, so I'm hoping someone
> here can help me. Does anyone know why the first expression doesn't
> evaluate to x^2 all by itself? How I can force it to do so?
> 
> Carl
> 
> 


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