题目🌿：Quasi-Homomorphisms on Mapping Class Groups

报告人：王家军 研究员（北京大学）

地点🎲：致远楼103室

时间🚴🏼‍♂️：2019年11月18日 10:30-11:30

摘要：We construct infinitely many linearly independent quasi-homomorphisms on the mapping class group of a Riemann surface with genus at least two which vanish on a handlebody subgroup. As a corollary, we disprove a conjecture of Reznikov on bounded generation of Heegaard splittings. Another corollary is that there are infinitely many linearly independent quasi-invariants on the Heegaard splittings of three-manifolds. This is joint work with Jiming Ma.

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