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Polygons have ears. (English) Zbl 0304.54038

MSC:
54F50 Topological spaces of dimension \(\leq 1\); curves, dendrites
57N05 Topology of the Euclidean \(2\)-space, \(2\)-manifolds (MSC2010)
52A10 Convex sets in \(2\) dimensions (including convex curves)
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