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A generalization of the PoincarĂ©-Birkhoff theorem. (English) Zbl 0522.55005

MSC:
55M25 Degree, winding number
57N05 Topology of the Euclidean \(2\)-space, \(2\)-manifolds (MSC2010)
54H25 Fixed-point and coincidence theorems (topological aspects)
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