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Re: FourierTransform of Sign^2 ?

• To: mathgroup at smc.vnet.net
• Subject: [mg80049] Re: FourierTransform of Sign^2 ?
• From: dimitris <dimmechan at yahoo.com>
• Date: Sat, 11 Aug 2007 02:13:15 -0400 (EDT)
• References: <f9gv9e$b82$1@smc.vnet.net>

On 10    , 09:06, "Jung-Tsung Shen" <jus... at gmail.com> wrote:
> I tried to evaluate the following Fourier Transform:
>
> FourierTransform[Sign[y] Sign[y], y, q]
>
> where Sign is the sign function. Instead of Sqrt[2 Pi]*DiracDelta[q],
> Mathematica (v. 5.0, Mac) gives
>
> -Sqrt[2 Pi]*DiracDelta[q]
>
> with a minus sign. Is this a bug or I am doing something wrong here?
>
> Thanks.
>
> JT


 I think you have one more reason for upgrading!

Dimitris