Fourier–Deligne transform

Fourier–Deligne transform

In algebraic geometry, the Fourier–Deligne transform, or ℓ-adic Fourier transform, or geometric Fourier transform, is an operation on objects of the derived category of -adic sheaves over the affine line. It was introduced by Pierre Deligne on November 29th, 1976 in a letter to David Kazhdan as an analogue of the usual Fourier transform. It was used by Laumon (1987) to simplify Deligne's proof of the Weil conjectures.

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