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FourierTransform of Sign^2 ?
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