Four-dimensional Dehn twists and Gromov-Witten invariants.
Location
Zoom - Please join the math_symplectic email list through mailman.stanford.edu to receive the Zoom link and the password/
Event Series
Event Type
Seminar
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.