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Re: Unexpected non-evaluation problem

• To: mathgroup at smc.vnet.net
• Subject: [mg63170] Re: Unexpected non-evaluation problem
• From: "James Gilmore" <james.gilmore at yale.edu>
• Date: Fri, 16 Dec 2005 07:22:27 -0500 (EST)
• Organization: Yale University
• References: <dnrch3$kie$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

What version of Mathematica are you using?

In[18]:=
$Version
Out[18]=
"5.0 for Microsoft Windows (June 11, 2003)"
In[19]:=
InverseFourierTransform[FourierTransform[x^2, x, y], y, x]
Out[19]=
x^2
In[20]:=
Sqrt[2*Pi]*x^2*FourierTransform[DiracDelta[y], y, x]
Out[20]=
x^2

-- 
James Gilmore

Graduate Student
Department of Physics
Yale University
New Haven, CT 06520 USA

"Carl Cotner" <carl.cotner at gmail.com> wrote in message 
news:dnrch3$kie$1 at smc.vnet.net...
>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
>