Stanford University

Upcoming Events

Wednesday, January 26, 2022
3:15 PM
TBA
Wednesday, January 26, 2022
4:30 PM
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384I
TBA

 

 

Thursday, January 27, 2022
2:00 PM
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384H
Thursday, January 27, 2022
4:30 PM
|
380Y
Friday, January 28, 2022
12:30 AM
|
381IU
Friday, January 28, 2022
12:00 PM
|
zoom
Allen Knutson (Cornell)

The combinatorics of a simple normal crossings divisor determines a "dual" simplicial complex. Kollár and Xu showed that when this divisor is anticanonical, the simplicial complex has the rational homology of a sphere. I'll construct two resolutions-of-singularities of Richardson varieties (a…

Friday, January 28, 2022
12:30 PM
|
384I
Friday, January 28, 2022
1:00 PM
|
384H
Friday, January 28, 2022
2:00 PM
|
384H
Friday, January 28, 2022
4:00 PM
|
Zoom
Qianhe Qin

 

In this talk, we will investigate torsions of the mapping class group Mod(S_g) of a surface S_g with genus g>1. We will show that finite subgroups of Mod(S_g) have order at most 84(g-1) and Mod(S_g) have no torsion element with order larger than 4g+2. At the end, we will prove that…