Abstract
This chapter describes the class of discrete subgroups of the universal covering group that we shall consider: the cofinite discrete subgroups. The covering \(\tilde \Gamma \) of the modular group and all its subgroups of finite index belong to this class. This includes the groups \({\tilde \Gamma _\theta }\) and \({\tilde \Gamma _{com}}\) considered in the Chapters 14 and 15. There are many more cofinite discrete groups; most of them have nothing to do with the modular group.
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© 1994 Springer Basel AG
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Bruggeman, R.W. (1994). Discrete subgroups. In: Families of Automorphic Forms. Modern Birkhäuser Classics. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0346-0336-2_3
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DOI: https://doi.org/10.1007/978-3-0346-0336-2_3
Publisher Name: Birkhäuser, Basel
Print ISBN: 978-3-0346-0335-5
Online ISBN: 978-3-0346-0336-2
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