談話会


2017/12/11(Mon)

16:30--17:30 数学教室 大セミナー室 (E404)

逆井卓也

東京大学

Additive invariants of homology cobordisms of surfaces

We construct additive invariants of homology cobordisms of surfaces by using their relationship with the symplectic derivation Lie algebra and the cohomology of the moduli space of graphs. This talk is based on joint works with Shigeyuki Morita, Masaaki Suzuki and Gwénaël Massuyeau.