The orientability of subgroups of plane groups. (English) Zbl 0489.20036
Groups, Conf. St. Andrews 1981, Lond. Math. Soc. Lect. Note Ser. 71, 221-227 (1982).
MSC:
20H10 | Fuchsian groups and their generalizations (group-theoretic aspects) |
20F05 | Generators, relations, and presentations of groups |
20F65 | Geometric group theory |