JP Journal of Algebra, Number Theory and Applications
Volume 14, Issue 2, Pages 191 - 201
(August 2009)
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CONSTRUCTION OF CYCLOIDAL FREE SUBGROUPS OF HECKE GROUPS OF FINITE INDEX
Aysun Yurttas (Turkey), Musa Demirci (Turkey), Hatice Ozbay (Turkey), Muge Capkin (Turkey) and Ismail Naci Cangul (Turkey)
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Here these subgroups are given by
their signatures for
first, and then for all q.
It is found that when
has no cycloidal free subgroups.