Re: Unexpected non-evaluation problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg63142] Re: Unexpected non-evaluation problem*From*: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>*Date*: Thu, 15 Dec 2005 06:07:19 -0500 (EST)*Organization*: The Open University, Milton Keynes, UK*References*: <dnrch3$kie$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Carl Cotner wrote: > 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 > Hi Carl, Mapping *Evaluate* to all parts will do it. Why? I do not know... In[1]:= Evaluate //@ InverseFourierTransform[FourierTransform[x^2, x, y], y, x] Out[1]= x^2 Best regards, /J.M.

**Follow-Ups**:**Re: Re: Unexpected non-evaluation problem***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>