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MathGroup Archive 2007

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Re: FourierTransform of Sign^2 ?

  • To: mathgroup at
  • Subject: [mg80048] Re: [mg79997] FourierTransform of Sign^2 ?
  • From: Sseziwa Mukasa <mukasa at>
  • Date: Sat, 11 Aug 2007 02:12:44 -0400 (EDT)
  • References: <>

On Aug 10, 2007, at 1:52 AM, Jung-Tsung Shen 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?

v5.2 on a Mac gives

FourierTransform[Sign[y] Sign[y], y, q]
Sqrt[2 Pi] DiracDelta[q]



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