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
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
收藏
页码:341 / 356
页数:16
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