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The normal closure of a bounding pair map in its mapping class group

组织者

深谷賢治 , 杨琳 , 塞巴斯蒂安·赫勒 , 河井公大朗

演讲者

Lei Chen

时间

2025年12月02日 15:00 至 16:00

地点

A3-4-301

线上

Zoom 388 528 9728 (BIMSA)

摘要

Johnson showed that the normal subgroup of a mapping class group generated by the genus 1 bounding pair maps is equal to the Torelli group. Generalizing Johnson's result, we give two descriptions of the normal subgroup generated by the genus n bounding pair maps using the Chillingworth and the Casson--Morita invariants.