搜索结果: 1-1 共查到“知识库 cofinite subgroups”相关记录1条 . 查询时间(0.053 秒)
For every positive integer n, we exhibit a cofinite subgroup Gn of the mapping class group of a surface of genus at most two such that Gn admits an epimorphism onto a free group of rank n. We conclude...