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In mathematics, Kolmogorov's normability criterion is a theorem that provides a necessary and sufficient condition for a topological vector space to be normable; that is, for the existence of a norm on the space that generates the given topology. The normability criterion can be seen as a result in same vein as the Nagata–Smirnov metrization theorem and Bing metrization theorem, which gives a necessary and sufficient condition for a topological space to be metrizable. The result was proved by the Russian mathematician Andrey Nikolayevich Kolmogorov in 1934.

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  • Kolmogorov's normability criterion (en)
  • Twierdzenie Kołmogorowa o normowaniu przestrzeni liniowo-topologicznych (pl)
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  • In mathematics, Kolmogorov's normability criterion is a theorem that provides a necessary and sufficient condition for a topological vector space to be normable; that is, for the existence of a norm on the space that generates the given topology. The normability criterion can be seen as a result in same vein as the Nagata–Smirnov metrization theorem and Bing metrization theorem, which gives a necessary and sufficient condition for a topological space to be metrizable. The result was proved by the Russian mathematician Andrey Nikolayevich Kolmogorov in 1934. (en)
  • Twierdzenie Kołmogorowa o normowaniu przestrzeni liniowo-topologicznych - twierdzenie charakteryzujące te przestrzenie liniowo-topologiczne, w których da się wprowadzić normę tak by oryginalna topologia przestrzeni pokrywała się z topologią wprowadzoną przez normę (tj. przestrzenie normowalne). Twierdzenie udowodnione w 1934 przez A. N. Kołmogorowa. (pl)
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  • Kolmogorov's normability criterion (en)
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  • In mathematics, Kolmogorov's normability criterion is a theorem that provides a necessary and sufficient condition for a topological vector space to be normable; that is, for the existence of a norm on the space that generates the given topology. The normability criterion can be seen as a result in same vein as the Nagata–Smirnov metrization theorem and Bing metrization theorem, which gives a necessary and sufficient condition for a topological space to be metrizable. The result was proved by the Russian mathematician Andrey Nikolayevich Kolmogorov in 1934. (en)
  • Twierdzenie Kołmogorowa o normowaniu przestrzeni liniowo-topologicznych - twierdzenie charakteryzujące te przestrzenie liniowo-topologiczne, w których da się wprowadzić normę tak by oryginalna topologia przestrzeni pokrywała się z topologią wprowadzoną przez normę (tj. przestrzenie normowalne). Twierdzenie udowodnione w 1934 przez A. N. Kołmogorowa. (pl)
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  • A topological vector space is normable if and only if it is a T1 space and admits a bounded convex neighbourhood of the origin. (en)
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