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Subgroups of surface groups are almost geometric. (English) Zbl 0412.57006


MSC:

57N05 Topology of the Euclidean \(2\)-space, \(2\)-manifolds (MSC2010)
51M10 Hyperbolic and elliptic geometries (general) and generalizations
57M05 Fundamental group, presentations, free differential calculus
57M10 Covering spaces and low-dimensional topology
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