The index formula for the Hecke group H_5
Group Theory
2014-05-27 v3
Abstract
The present article gives the index formula of the principal congruence subgroups of the Hecke group H_5
Cite
@article{arxiv.1401.0775,
title = {The index formula for the Hecke group H_5},
author = {Cheng Lien Lang and Mong Lung Lang},
journal= {arXiv preprint arXiv:1401.0775},
year = {2014}
}
Comments
The current version includes a proof of the fact that the commutator subgroup of H_5 is not congruence