On the top betti number of subgroups of \(SL(n,Z)\). (English) Zbl 0505.20035


20H05 Unimodular groups, congruence subgroups (group-theoretic aspects)
20G10 Cohomology theory for linear algebraic groups
11F03 Modular and automorphic functions
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[1] Ash, A.: Cohomology of congruence subgroups of SL(n, ?) Math. Ann.249, 55-73 (1980) · Zbl 0438.20035
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[4] Lee, R., Szczarba, R.H.: On the homology and cohomology of congruence subgroups. Invent. Math.33, 15-53 (1976) · Zbl 0332.18015
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