On the Normalizer of the Congruence Subgroup H_0^5(I) of the Hecke Group H^5

Authors: SÜLEYMAN UZUN

Abstract: Let l = 2 cos \frac{\pi}{5} and let H^5 be the Hecke group associated to l. In this paper, the normalizers of the congruence subgroups H_0^5(I) in PSL(2Z[\lambda]) are studied in the case where I = (2)^aI ', (2, I') = 1 and I' is a prime ideal.

Keywords: Normalizer, Congruence subgroup, Hecke group

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