Urysohn's lemma
nameEtymology
Named after the mathematician Pavel Samuilovich Urysohn.
Definitions
A lemma stating that a topological space is normal if and only if any two disjoint closed…
A lemma stating that a topological space is normal if and only if any two disjoint closed subsets can be separated by a continuous function.
The neighborhood
Vish — recursive loop
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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA