I found this formula in a paper:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\int exp( \frac{x1 + i x2}{ \sqrt 2} \eta^* - \frac{x1 - i x2}{ \sqrt 2}

\eta) D(\eta)/ \pi d^2 \eta[/tex]

the author calls it the Fourier transform of D.

It is the first time thar i see this formula.

How common is this notation? Can we use it without problem?

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# Fourier transform with complex variables

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