Wohlfahrt's Theorem for the Hecke group G5

被引：1

作者：

Lang, Cheng Lien ^{[1
]}

Lang, Mong Lung ^{[1
]}

机构：

[1] I Shou Univ, Dept Math, Kaohsiung, Taiwan

来源：

JOURNAL OF ALGEBRA | 2015年 / 422卷

关键词：

Hecke groups; Congruence subgroups; Wohlfahrt's Theorem; MODULAR GROUP; CONGRUENCE; SUBGROUPS;

D O I：

10.1016/j.jalgebra.2014.08.056

中图分类号：

O1 [数学];

学科分类号：

0701 ; 070101 ;

摘要：

Let K be a subgroup of the inhomogeneous Hecke group G(5) of geometric level r. Then K is congruence if and only if K contains the principal congruence subgroup G(2r). In the case r not equivalent to 0 (mod 4), K is congruence if and only if K contains the principal congruence subgroup G(r). (C) 2014 Elsevier Inc. All rights reserved.

引用

页码：341 / 356

页数：16

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