Please use this identifier to cite or link to this item: https://doi.org/10.1112/blms/bdl001
Title: The structure of the normalisers of the congruence subgroups of the Hecke group G5
Authors: Lang, M.L. 
Issue Date: Feb-2007
Citation: Lang, M.L. (2007-02). The structure of the normalisers of the congruence subgroups of the Hecke group G5. Bulletin of the London Mathematical Society 39 (1) : 53-62. ScholarBank@NUS Repository. https://doi.org/10.1112/blms/bdl001
Abstract: Let λ = 2cos (π/5) and let τ ∈ ℤ[λ]. Denote the normaliser of G0(τ) of the Hecke group G5 in PSL2(ℝ) by N(G0(τ)). Then N(G0(τ)) = G0(τ/h), where h is the largest divisor of 4 such that h 2 divides τ. Further, N(G0(τ))/G 0(τ) is either 1 (if h = 1), ℤ2 × ℤ2 (if h = 2) or ℤ4 × ℤ4 (if h = 4). © 2006 London Mathematical Society.
Source Title: Bulletin of the London Mathematical Society
URI: http://scholarbank.nus.edu.sg/handle/10635/104365
ISSN: 00246093
DOI: 10.1112/blms/bdl001
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