Normalizers of the congruence subgroups of the Hecke group G(5)

Authors
Citation
Ml. Lang et Sp. Tan, Normalizers of the congruence subgroups of the Hecke group G(5), P AM MATH S, 127(11), 1999, pp. 3131-3140
Citations number
11
Categorie Soggetti
Mathematics
Journal title
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY
ISSN journal
00029939 → ACNP
Volume
127
Issue
11
Year of publication
1999
Pages
3131 - 3140
Database
ISI
SICI code
0002-9939(199911)127:11<3131:NOTCSO>2.0.ZU;2-H
Abstract
Let lambda = 2cos(pi/5) and let G be the Hecke group associated to lambda. In this article, we show that for tau a prime ideal in Z [lambda], the cong ruence subgroups G(o)(tau) of G are self-normalized in PSL2( R).