• Title/Summary/Keyword: pseudometrization

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THE IDEMPOTENT RELATION AND THE PROOF OF URYSOHN'S LEMMA

  • Kim, Seungwook
    • Korean Journal of Mathematics
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    • v.17 no.4
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    • pp.411-417
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    • 2009

  • The Urysohn's lemma which is crucial tool for the study of the metrization problem is proved in the sense of set-theoretic concept, namely, by the idempotent relation defined on a given topology.

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