An asymptotic result for subgroups of SL(2,Z) of level 2

zbMath0646.20036MaRDI QIDQ1103727

Morris Newman

Publication date: 1988

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

zbMATH Keywords

sums of squaressubgroups of finite indexlevelmodular groupsprincipal congruence subgroup

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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