Free subgroups of the parametrized modular group
We study free subgroups of index four of the parametrized modular group Π, the subgroup of SL(2; Z[ξ]) generated by (10 ξ1) and (01 -10). There are eight free subgroups, four of which are normal and four are non-normal. Then we study the intersections of the normal subgroups. We give canonical prese...
- Autores:
-
Pommerenke, Christian
Toro, Margarita
- Tipo de recurso:
- Article of journal
- Fecha de publicación:
- 2015
- Institución:
- Universidad Nacional de Colombia
- Repositorio:
- Universidad Nacional de Colombia
- Idioma:
- spa
- OAI Identifier:
- oai:repositorio.unal.edu.co:unal/66461
- Acceso en línea:
- https://repositorio.unal.edu.co/handle/unal/66461
http://bdigital.unal.edu.co/67489/
- Palabra clave:
- 51 Matemáticas / Mathematics
Parametrized modular group
free subgroups
Bianchi groups
Picard group
discrete relativity theory
- Rights
- openAccess
- License
- Atribución-NoComercial 4.0 Internacional
| Summary: | We study free subgroups of index four of the parametrized modular group Π, the subgroup of SL(2; Z[ξ]) generated by (10 ξ1) and (01 -10). There are eight free subgroups, four of which are normal and four are non-normal. Then we study the intersections of the normal subgroups. We give canonical presentations in terms of generators and relations. At the end of the paper we study connections between and the Bianchi groups, the two-parabolic group and a group from relativity theory. |
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