Regular maps and principal congruence subgroups of Hecke groups

Regular maps and principal congruence subgroups of Hecke groups
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DOI:
10.1016/j.ejc.2004.01.010
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发表时间:
2005-04
期刊:
Eur. J. Comb.
影响因子:
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通讯作者:
I. Ivrissimtzis;D. Singerman
I. Ivrissimtzis;D. Singerman
中科院分区:
其他
文献类型:
--
作者:
I. Ivrissimtzis;D. Singerman

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正则q价映射对应于三角形群(2,q,∞)的正规子群。其中,λq是由z→−1 z和z→−1 z+λq生成的Hecke群,其中,λq是其中的2个cos π q。研究了Hq的主同余子群所对应的正则映射。低指数的地图给出了许多有趣的规则图。
Regular q-valent maps correspond to normal subgroups of the triangle group (2,q,∞). This group has a representation as the Hecke group Hqwhich is generated by z→ −1 z and z→ −1 z+λq, where λq≔2 cos π q . We investigate the regular maps corresponding to the principal congruence subgroups of Hq. Those of low index give many interesting regular maps.