Fundamental lemma and Hitchin fibration

Fundamental lemma and Hitchin fibration

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Bao Châu Ngô, IAS
Fine Hall 314

The fundamental lemma is an identity of orbital integrals on p-adic reductive groups which was stated precisely by Langlands and Shelstads as a conjecture in the 80's. We now have a proof due to the efforts of many peoples with many ingredients. I will only explain how a certain particular type of geometry like affine Springer fibers and Hitchin were helpful in this proof.