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Matthias Ludewig
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Positivity of certain Fourier transform

Is the Fourier transform of the function $$ f(x) = e^{-t|\xi|^{2m}}$$ positive for $t>0$ and $m \in \mathbb{N}_0$?

Matthias Ludewig
  • 9.9k
  • 1
  • 30
  • 71