MIT Number Theory Seminar

Tuesday, October 31, 2023 at 4:30pm to 5:30pm

MIT, 2-449 182 Memorial Drive, Cambridge, MA 02142

SpeakersKęstutis Česnavičius  (Université Paris-Saclay)

Title:  The affine Grassmannian as a presheaf quotient

Abstract: The affine Grassmannian of a reductive group G is usually defined as the étale sheafification of the quotient of the loop group LG by the positive loop subgroup. I will discuss various triviality results for G-torsors which imply that this sheafification is often not necessary.






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Bjorn Poonen, Number Theory Seminar, Number_Theory_Seminar, Wei Zhang, Andrew Sutherland


Department of Mathematics


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