Normal Subgroups of Hecke Groups H(λ)
Let λ ≥ 2 and let H ( λ ) be the Hecke group associated to λ . Also let H ( λ )\ U be the Riemann surface associated to the Hecke group H ( λ ). In this article, we study the even subgroup H e ( λ ) and the power subgroups H m ( λ ) of the Hecke groups H ( λ ). We also study some genus 0 normal sub...
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Veröffentlicht in: | Algebras and representation theory 2010-04, Vol.13 (2), p.219-230 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
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Zusammenfassung: | Let
λ
≥ 2 and let
H
(
λ
) be the Hecke group associated to
λ
. Also let
H
(
λ
)\
U
be the Riemann surface associated to the Hecke group
H
(
λ
). In this article, we study the even subgroup
H
e
(
λ
) and the power subgroups
H
m
(
λ
) of the Hecke groups
H
(
λ
). We also study some genus 0 normal subgroups of finite index of
H
(
λ
). Finally, we discuss free normal subgroups of
H
(
λ
). |
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ISSN: | 1386-923X 1572-9079 |
DOI: | 10.1007/s10468-008-9116-3 |