The minimum index of a non-congruence subgroup of \(\text{SL}_2\) over an arithmetic domain

DOI10.1007/BF02773059zbMath1020.20033OpenAlexW1988163623MaRDI QIDQ1870907

Andreas Schweizer, Alexander W. Mason

Publication date: 6 July 2003

Published in: Israel Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1007/bf02773059

zbMATH Keywords

subgroups of finite indexnon-congruence subgroupsarithmetic Dedekind rings

Mathematics Subject Classification ID

Subgroup theorems; subgroup growth (20E07) Unimodular groups, congruence subgroups (group-theoretic aspects) (20H05) Structure of modular groups and generalizations; arithmetic groups (11F06)

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