Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0021-8693(03)00421-6
Title: Groups commensurable with the modular group
Authors: Lang, M.L. 
Keywords: Groups commensurable with PSL2 (Z)
Issue Date: 15-Apr-2004
Citation: Lang, M.L. (2004-04-15). Groups commensurable with the modular group. Journal of Algebra 274 (2) : 804-821. ScholarBank@NUS Repository. https://doi.org/10.1016/S0021-8693(03)00421-6
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.
Source Title: Journal of Algebra
URI: http://scholarbank.nus.edu.sg/handle/10635/103357
ISSN: 00218693
DOI: 10.1016/S0021-8693(03)00421-6
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