No CrossRef data available.
Article contents
Congruence testing for odd subgroups of the modular group
Part of:
Other groups of matrices
Published online by Cambridge University Press: 01 May 2014
Abstract
Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.
We give a computationally effective criterion for determining whether a finite-index subgroup of $\mathrm{SL}_2(\mathbf{Z})$ is a congruence subgroup, extending earlier work of Hsu for subgroups of $\mathrm{PSL}_2(\mathbf{Z})$.
MSC classification
- Type
- Research Article
- Information
- Copyright
- © The Author(s) 2014
References
Behr, H. and Mennicke, J., ‘A presentation of the groups PSL(2, p)’, Canad. J. Math.
20 (1968) 1432–1438; MR 0236269.CrossRefGoogle Scholar
Hsu, T., ‘Identifying congruence subgroups of the modular group’, Proc. Amer. Math. Soc.
124 (1996) 1351–1359; MR 1343700.CrossRefGoogle Scholar
Kiming, I., Schütt, M. and Verrill, H. A., ‘Lifts of projective congruence groups’, J. Lond. Math. Soc. (2)
83 (2011) 96–120; MR 2763946.CrossRefGoogle Scholar
You have
Access