This is a known issue. See https://github.com/sympy/sympy/issues/12591
and https://github.com/sympy/sympy/issues/7178.

Aaron Meurer

On Wed, Nov 1, 2017 at 7:54 PM, Daniele Nicolodi <[email protected]> wrote:
> Hello,
>
> this comes rather unexpected:
>
>>>> from sympy import fourier_transform
>>>> from sympy.abc import x, y
>>>> fourier_transform(1, x, y)
> 0
>
> especially because:
>
>>>> fourier_transform(DiracDelta(x), x, y)
> 1
>>>> inverse_fourier_transform(DiracDelta(x), x, y)
> 1
>
> This is with:
>
>>>> sympy.__version__
> '1.1.1'
>
> Is this a bug or am I missing something?
>
> As a consequence of this, I guess, other trivial transforms also appear
> to be wrong:
>
>>>> fourier_transform(exp(I * omega * x), x, y)
> 0
>
>
> Thanks. Cheers,
> Daniele
>
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