FINITE PRESENTATIONS OF CENTRALLY EXTENDED MAPPING CLASS GROUPS
キーワード:
mapping class group,
central extension
2019 年 73 巻 1 号 p. 103-113
詳細
2019 年 73 巻 1 号 p. 103-113
We describe a finite presentation of Tg,r for g ≥ 3. Here Tg,r is the universal central extension of the mapping class group of the surface of genus g with r-boundaries. We also investigate the cases of g = 2 and 3, and give an application.
