Congruence Subgroups of Groups Commensurable with PSL
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Congruence Subgroups of PSL(2, Z) of Genus Less than or Equal to 24
A subgroup of Γ which contains some principal congruence subgroup is called a congruence subgroup. The level of a congruence subgroup G is the smallest N such that Γ(N) ⊂ G. The literature on congruence subgroups is vast, and the subject remains very active. Rademacher conjectured that there are only finitely many genus 0 congruence subgroups. This problem was studied by Knopp and Newman [Knopp...
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تاریخ انتشار 2004