Singular support of coherent sheaves (4/4)

Singular support is an invariant that can be attached to a coherent sheaf

on a derived scheme which is quasi-smooth (a.k.a. derived locally complete

intersection). This invariant measures how far a given coherent sheaf is

from being perfect. We will explain how the subtle difference between

"coherent" and "perfect" is responsible for the appearance of  Arthur 

parameters in the context of geometric Langlands correspondence.

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