Monday, October 12, 2020 1:00 PM
Gleb Smirnov (ETH Zurich)

A new proof will be given that Seidel's generalized Dehn twist is not symplectically isotopic to the identity. The argument will stay in the language of counting holomorphic spheres in families and family Seiberg-Witten invariants and will not rely on any Floer-theoretic considerations.