Identifying normal and congruence subgroups
Number Theory
2015-01-06 v1
Abstract
We give a simple algorithm that enables us to determine whether a subgroup of finite index of the Hecke group is normal.
Cite
@article{arxiv.1501.00743,
title = {Identifying normal and congruence subgroups},
author = {Cheng Lien Lang and Mong Lung Lang},
journal= {arXiv preprint arXiv:1501.00743},
year = {2015}
}