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|Title:||Groups commensurable with the modular group|
|Keywords:||Groups commensurable with PSL2 (Z)|
|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|
|Appears in Collections:||Staff Publications|
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