Separation axioms as absolute properties under monotone unions in weak topology
Adeniran, Tinuoye M. (1976)
Portugaliae mathematica
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Adeniran, Tinuoye M. (1976)
Portugaliae mathematica
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A metric space (X,d) is monotone if there is a linear order < on X and a constant c such that d(x,y) ≤ cd(x,z) for all x < y < z in X, and σ-monotone if it is a countable union of monotone subspaces. A planar set homeomorphic to the Cantor set that is not σ-monotone is constructed and investigated. It follows that there is a metric on a Cantor set that is not σ-monotone. This answers a question raised by the second author.
Philip Hartman (1976)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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