Cours de l'IHÉS 2014-2015
# Singular support of coherent sheaves (2/4)

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Amphithéâtre Léon Motchane (IHES)
### Amphithéâtre Léon Motchane

#### IHES

Le Bois Marie 35, route de Chartres 91440 Bures-sur-Yvette

Description

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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