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Sets of constant distance from a planar set. (English) Zbl 0244.54019


MSC:

54E35 Metric spaces, metrizability
57N05 Topology of the Euclidean \(2\)-space, \(2\)-manifolds (MSC2010)
57N15 Topology of the Euclidean \(n\)-space, \(n\)-manifolds (\(4 \leq n \leq \infty\)) (MSC2010)
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