Please use this identifier to cite or link to this item: https://doi.org/10.1006/jnth.2000.2555
Title: Normalizer of Γ1(m)
Authors: Lang, M.-L. 
Keywords: Congruence subgroups; modular group; normalizer; big picture of Conway
Issue Date: Jan-2001
Citation: Lang, M.-L. (2001-01). Normalizer of Γ1(m). Journal of Number Theory 86 (1) : 50-60. ScholarBank@NUS Repository. https://doi.org/10.1006/jnth.2000.2555
Abstract: Let m∈N. Denote by N(Γ1(m)) the normalizer of Γ1(m) in PSL2(R). Then (i) N(Γ1(4))=N(Γ0(4))=Γ0(22)+; (ii) if m≠4, then N(Γ1(m))=Γ0(m)+. © 2001 Academic Press.
Source Title: Journal of Number Theory
URI: http://scholarbank.nus.edu.sg/handle/10635/103641
ISSN: 0022314X
DOI: 10.1006/jnth.2000.2555
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