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| SOME SUBGROUPS OF THE EXTENDED HECKE GROUPS (λ_q) | |
| 作者姓名： | Recep Sahin Osman Bizim |
| 作者单位： | Department of Mathematics，Faculty of Arts and Sciences，Balikesir University，10100 Balikesir/TURKEY，Department of Mathematics，Faculty of Arts and Sciences，Uludag University，16059 Bursa/TURKEY |
| 摘 要： | The authors consider the extended Hecke groups H(λq) generated by T(z) = -1 / z, S(z) = -1/(z + λq,) and R(z) = 1 / z with A, = 2 cos(π/q) for q≥3 an integer. In this paper, the even subgroup He(λq), the second commutator subgroup H (λq) and the principal congruence subgroups Hp(λq) of the extended Hecke groups H(λq) are studied. Also, relations between them are given. |
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