CZECHOSLOVAK MATHEMATICAL JOURNAL, vol.54, no.1, pp.253-259, 2004 (SCI-Expanded)
Article / Article
CZECHOSLOVAK MATHEMATICAL JOURNAL
Science Citation Index Expanded (SCI-EXPANDED), Scopus
Hecke group, extended Hecke group, commutator subgroup
Bursa Uludag University Affiliated:
Hecke groups H(lambda(q)) are the discrete subgroups of PSL(2, R) generated by S(z) = -(z + lambda(q))(-1) and T(z) = -1/z. The commutator subgroup of H(lambda(q)), denoted by H'(lambda(q)), is studied in . It was shown that H'(lambda(q)) is a free group of rank q - 1.