Urysohn's lemma
lemma that a topological space is normal iff any 2 disjoint closed subsets can be separated by a continuous function
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Urysohn's lemma
Summary
Urysohn's lemma is a lemma[1]. It has Wikipedia articles in 17 language editions, a strong signal of global cultural recognition.[2]
Key Facts
- Urysohn's lemma's instance of is recorded as lemma[3].
- Pavel Urysohn is named after Urysohn's lemma[4].
- Urysohn's lemma's Commons category is recorded as Urysohn's lemma[5].
- Urysohn's lemma's maintained by WikiProject is recorded as WikiProject Mathematics[6].
Body
Definition and Type
Urysohn's lemma's instance of is recorded as lemma[3].
Origins
Pavel Urysohn is named after Urysohn's lemma[4].
Why It Matters
Urysohn's lemma has Wikipedia articles in 17 language editions, a strong signal of global cultural recognition.[2] It is known by 4 alternative names across languages and contexts.[7]