Kuratowski's closure-complement problem
Sign in to savetheorem 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 facts
- Instance of
- theorem
- Part of
- topology
- Named after
- Kazimierz Kuratowski
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- maintained by WikiProject
- WikiProject Mathematics
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