# Symplectic embeddings via almost toric fibrations

## Location

Zoom

Monday, June 1, 2020 4:00 PM

Felix Schlenk (Université de Neuchâtel)

The solutions of certain 1-parametric symplectic embedding problems - like finding for each a>0 the smallest 4-ball B^4(c(a)) into which the ellipsoid E(1,a) symplectically embeds - have revealed that symplectic rigidity has an intricate fine structure. The first proofs of these results relied on hard facts about holomorphic curves. I will explain how Margaret Symington's almost toric fibrations and an observation of Roger Casals lead to much simpler proofs.