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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(online) ISSN 0002-9939(print)


Dedekind sums and noncongruence subgroups of the Hecke groups $ G(\sqrt{2})$ and $ G(\sqrt{3})$

Author: L. Alayne Parson
Journal: Proc. Amer. Math. Soc. 57 (1976), 194-196
MSC: Primary 10D05; Secondary 20H10
MathSciNet review: 0409363
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Abstract: An example is given of a character $ {\chi _r}$ on a subgroup of $ G(\sqrt 2 )$ or $ G(\sqrt 3 )$ such that the kernel of $ {\chi _r}$ is of finite index in $ G(\sqrt 2 )$ or $ G(\sqrt 3 )$ but is not a congruence subgroup.

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PII: S 0002-9939(1976)0409363-0
Article copyright: © Copyright 1976 American Mathematical Society

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