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 >