Kuratowski's closure-complement problem

theorem that the monoid generated by taking closures and complements of a given set in a topological space has size at most 14, attained by e.g. the set (0, 1) ∪ (1, 2) ∪ {3} ∪ ([4, 5] ∩ ℚ) of reals

Wikidata entity: Q6445654

P31 instance of ... Q1166625 (mathematical problem) mathematical problem
P31 instance of ... Q65943 (theorem) theorem
P6104 maintained by WikiProject ... Q8487137 (WikiProject Mathematics) WikiProject Mathematics
P138 named after ... Q161846 (Kazimierz Kuratowski) Kazimierz Kuratowski
P361 part of ... Q42989 (topology) topology
External Ids
P646Freebase ID/m/02q1zgw
P6366Microsoft Academic ID (discontinued)2781053527

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