Please use this identifier to cite or link to this item: https://doi.org/10.1006/jabr.2001.9024
Title: Normalisers of subgroups of the modular group
Authors: Lang, M.L. 
Keywords: Fundamental polygons
Lattices commensurable with ℤ x ℤ
Modular group
Normalisers
Issue Date: 1-Feb-2002
Citation: Lang, M.L. (2002-02-01). Normalisers of subgroups of the modular group. Journal of Algebra 248 (1) : 202-218. ScholarBank@NUS Repository. https://doi.org/10.1006/jabr.2001.9024
Abstract: Let G be a subgroup of finite index of the modular group Γ and let N(G) be the normaliser of G in PSL2(ℝ). In this article, we give an algorithm that determines N(G). © 2002 Elsevier Science (USA).
Source Title: Journal of Algebra
URI: http://scholarbank.nus.edu.sg/handle/10635/103640
ISSN: 00218693
DOI: 10.1006/jabr.2001.9024
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