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Le problème des groupes de congruence pour \(SL_2\). (Russian. French original) Zbl 0239.20063

MSC:
20H05 Unimodular groups, congruence subgroups (group-theoretic aspects)
20H10 Fuchsian groups and their generalizations (group-theoretic aspects)
20G30 Linear algebraic groups over global fields and their integers
14Fxx (Co)homology theory in algebraic geometry
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