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Dehn twists and symplectic mapping class groups

Event Category:
Reading Seminar on Automorphism Groups of Manifolds
Jie Min

I will introduce symplectic mapping class groups and survey what we know about them in dimension four. In particular I will talk about Seidel's result on cases where squared Dehn twist can be smoothly isotopic to identity but not symplectically isotopic to identity, on certain symplectic four manifolds.

Reference: Seidel, lectures on four dimensional Dehn twists.

Tuesday, October 3, 2023 - 4:00pm
LGRT 1685