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Derived Subspaces of Metric Spaces
Published online by Cambridge University Press: 20 November 2018
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It is shown that the boundary of the set of accumulation points of a metrizable space X is compact iff X has a compatible metric d such that d(A, B)>0 whenever A and B are disjoint closed subsets of X, each of which is disjoint from the set of accumulation points.
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- Copyright © Canadian Mathematical Society 1980