Identifying congruence subgroups of the modular group-Reference-Cited by-同舟云学术

Identifying congruence subgroups of the modular group

Published:1996 Issue:5 Volume:124 Page:1351-1359
ISSN:0002-9939
Container-title:Proceedings of the American Mathematical Society
language:en
Short-container-title:Proc. Amer. Math. Soc.

Author:

Hsu Tim

Abstract

We exhibit a simple test (Theorem 2.4) for determining if a given (classical) modular subgroup is a congruence subgroup, and give a detailed description of its implementation (Theorem 3.1). In an appendix, we also describe a more “invariant” and arithmetic congruence test.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Link

http://www.ams.org/proc/1996-124-05/S0002-9939-96-03496-X/S0002-9939-96-03496-X.pdf

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