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Alternative Title
Abstract
Let A and B be maximal subgroups of PSL2(ℝ) that commensurable with PSL2(ℤ) (S and T are commensurable with each other if S ∩ T is of finite index in both S and T). In this article, we determine the index [A: A ∩ B] and the level of A ∩ B (Appendix A). © 2004 Elsevier Inc. All rights reserved.
Keywords
Groups commensurable with PSL2 (Z)
Source Title
Journal of Algebra
Publisher
Series/Report No.
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Date
2004-04-15
DOI
10.1016/S0021-8693(03)00421-6
Type
Article