An abelian quotient of the mapping class group \(\mathfrak S\). (English) Zbl 0409.57009


57N05 Topology of the Euclidean \(2\)-space, \(2\)-manifolds (MSC2010)
20F34 Fundamental groups and their automorphisms (group-theoretic aspects)
57M05 Fundamental group, presentations, free differential calculus
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