The fundamental lemma and the Hitchin fibration [after Ngo Bao Chau]

Details The fundamental lemma and the Hitchin fibration [after Ngo Bao Chau] The fundamental lemma and the Hitchin fibration [after Ngo Bao Chau]

2011-03-21

arxiv.org/abs/1103.4066v1

Mathematics

Representation Theory

Bourbaki seminar 1035, April 2011

Scientific paper

This article is a Bourbaki seminar report on Ngo Bao Chau's proof of the fundamental lemma. About thirty years ago, R. P. Langlands conjectured a collection of identities to hold among integrals over conjugacy classes in reductive groups. Ngo Bao Chau has proved these identities (collectively called the fundamental lemma) by interpreting the integrals in terms of the cohomology of the fibers of the Hitchin fibration. The fundamental lemma has profound consequences for the theory of automorphic representations. Significant recent theorems in number theory use the fundamental lemma as an ingredient in their proofs.

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