About: http://dbpedia.org/resource/Kuratowski's_closure-complement

Property	Value
dbo:description	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 (en)
dbo:wikiPageExternalLink	http://nzjm.math.auckland.ac.nz/images/6/63/The_Kuratowski_Closure-Complement_Theorem.pdf http://www.maa.org/publications/periodicals/loci/supplements/the-kuratowski-closure-complement-problem
dbo:wikiPageWikiLink	dbr:Interior_(topology) dbr:Involution_(mathematics) dbr:Algebra dbr:Complement_(set_theory) dbc:Mathematical_problems dbr:Closure_(topology) dbr:Interval_(mathematics) dbr:John_L._Kelley dbc:Topology dbr:Topological_space dbr:Monoid dbr:Kazimierz_Kuratowski dbr:Point-set_topology dbr:Idempotency dbr:Real_numbers
dbp:date	2022-02-12 (xsd:date)
dbp:url	https://web.archive.org/web/20220212062843/http:/nzjm.math.auckland.ac.nz/images/6/63/The_Kuratowski_Closure-Complement_Theorem.pdf
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rdfs:label	Kuratowski's closure-complement problem (en) مسألة كوراتويسكي للغلق-التكملة (ar) Théorème de fermeture/complémentaire de Kuratowski (fr) 쿠라토프스키 모노이드 (ko) Задача Куратовского (ru) 庫拉托夫斯基十四集問題 (zh)
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About: http://dbpedia.org/resource/Kuratowski's_closure-complement_problem