Normal Subgroups of Hecke Groups H(lambda)

Koruoglu O., ŞAHİN R., İKİKARDEŞ S., CANGÜL İ. N.

ALGEBRAS AND REPRESENTATION THEORY, cilt.13, sa.2, ss.219-230, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 13 Sayı: 2
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1007/s10468-008-9116-3
  • Dergi Adı: ALGEBRAS AND REPRESENTATION THEORY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.219-230
  • Bursa Uludağ Üniversitesi Adresli: Evet

Özet

Let lambda >= 2 and let H(lambda) be the Hecke group associated to lambda. Also let H(lambda)\U be the Riemann surface associated to the Hecke group H(lambda). In this article, we study the even subgroup H(e)(lambda) and the power subgroups H(m)(lambda) of the Hecke groups H(lambda). We also study some genus 0 normal subgroups of finite index of H(lambda). Finally, we discuss free normal subgroups of H(lambda).