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bn:03270794n
Noun Concept
EL
λήμμα urysohn
EN
In topology, Urysohn's lemma is a lemma that states that a topological space is normal if and only if any two disjoint closed subsets can be separated by a continuous function. Wikipedia
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Sources
IS A
EN
lemma
NAMED AFTER
EN
Pavel Urysohn
Wikipedia Translations
EL
λήμμα urysohn

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