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Results tagged with gr.group-theory
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user 489806
Questions about the branch of algebra that deals with groups.
2
votes
Are there noncongruence subgroups (of finite index) of the modular group generated only by 2...
This is an old question, but I wanted to add a sort of elementary answer, which shows in particular that any subgroup of $\operatorname{PSL}_2(\mathbb{Z})$ of index 7 isomorphic to $\mathbb{Z}*\mathbb …
- 404