Re: FourierTransform
- To: mathgroup at smc.vnet.net
- Subject: [mg52527] Re: [mg52517] FourierTransform
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Wed, 1 Dec 2004 05:57:43 -0500 (EST)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
$Version 5.1 for Mac OS X (October 25, 2004) FourierTransform[f'[x],x,k] (-I)*k*FourierTransform[f[x], x, k] Bob Hanlon > > From: "Dr A.H. Harker" <a.harker at ucl.ac.uk> To: mathgroup at smc.vnet.net > Date: 2004/11/30 Tue AM 05:24:41 EST > To: mathgroup at smc.vnet.net > Subject: [mg52527] [mg52517] FourierTransform > > In Version 4 Mathematica was smart enough to know that > > FourierTransform[f'[x], x, k] > > should give > > -\[ImaginaryI] k FourierTransform[f[x], x, k]. > > Version 5 seems no longer to do this -- a nice classroom demonstration and > a valuable method of solving differential equations down in flames. > > Why is this? > > > Tony Harker (Dr A.H. Harker) > Deputy Head of Department > Deputy Head, Condensed Matter and Materials Physics Group > Department of Physics and Astronomy > University College London > Gower Street > LONDON > WC1E 6BT > (44)(0)207 679 3404 > a.harker at ucl.ac.uk > > > >