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On the homeotopy group of a non-orientable surface. (English) Zbl 0232.57001

Proc. Camb. Philos. Soc. 71, 437-448 (1972); erratum ibid. 136, 441 (2004).

MSC:

57N05 Topology of the Euclidean \(2\)-space, \(2\)-manifolds (MSC2010)
57M05 Fundamental group, presentations, free differential calculus
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