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Normalizers of the congruence subgroups of the Hecke group

Authors:	Mong-Lung Lang Ser-Peow Tan

Affiliation:	Department of Mathematics, National University of Singapore, Singapore 119260, Republic of Singapore ; Department of Mathematics, National University of Singapore, Singapore 119260, Republic of Singapore

Abstract:	Let cos and let be the Hecke group associated to . In this article, we show that for a prime ideal in , the congruence subgroups $G_{0}(tau )$ of are self-normalized in $PSL_{2}(mathbb{R})$ .

Keywords:	Congruence subgroups Hecke groups

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