A note on non-congruence subgroups

DOI10.1080/00927878408823023zbMath0541.20031OpenAlexW2005585804MaRDI QIDQ3328742

Phillip Ronald Helm

Publication date: 1984

Published in: Communications in Algebra (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1080/00927878408823023

zbMATH Keywords

non-congruence subgroupsnormal subgroup of modular group

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) Other matrix groups over rings (20H25)

Cites Work

• Free non-Abelian quotients of \(SL_ 2\) over orders of imaginary quadratic numberfields
• Generators for Alternating and Symmetric Groups
• The orders of the linear groups
• Unnamed Item

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