Home›Lemmas›Bổ đề Urysohn🌐Tiếng ViệtEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTiếng ViệtРусскийالعربيةفارسی한국어中文日本語EntityQ1816967· pop 19· linked from 109 articlesBổ đề Urysohnlemma that a topological space is normal iff any 2 disjoint closed subsets can be separated by a continuous functionWikidata factsImageUrysohn-function01.svgShow 1 more factCommons categoryUrysohn's lemmaSources (1)wikidata.orgvia Wikidata · CC0Available in 18 languagesEspañolFrançaisDeutsch中文РусскийPortuguêsItalianoCatalanFinnishHebrewNederlandsConnectionscontinuous functionEntityseparated setsEntityCategoriesLemmasSeparation axiomsTheorems in topologyTheory of continuous functions