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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
> 
> 
> 
>