SHMARQL

Kuratowski's closure-complement problem

<http://www.wikidata.org/entity/Q6445654>

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
rdfs:label
"Kuratowski's closure-complement problem"@en
schema: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
schema:dateModified "2026-09-06T21:10:18+00:00"^^xsd:dateTime
schema:version 2541317551
wikibase:identifiers 2
wikibase:sitelinks 6
wikibase:statements 7
p:P138 wd:statement/Q6445654-932793e0-4a45-73c3-f9c4-f8a06835b01e
p:P31 wd:statement/Q6445654-2459F207-08C0-4738-98DB-36FF355FB041
wd:statement/Q6445654-95a24e7e-43c3-1a5b-f77a-6f44863f92b7
p:P361 wd:statement/Q6445654-de468aae-4270-9187-cd1c-afaf6e89dd0e
p:P6104 wd:statement/Q6445654-F1ED0832-7C7E-46B6-A8D1-5133DAB4A9BF
p:P6366 wd:statement/Q6445654-C468FE1B-5EFE-4CCD-917D-C0FD4B895EB0
p:P646 wd:statement/Q6445654-00E4F988-A39B-41FB-948B-AF00F1969C88
p:direct-normalized/P6366 <https://makg.org/entity/2781053527>
wdt:P138 Kazimierz Kuratowski
wdt:P31 mathematical problem
theorem
wdt:P361 topology
wdt:P6104 WikiProject Mathematics
wdt:P6366 "2781053527"
wdt:P646 "/m/02q1zgw"
Download as:
TurtleJSON-LDRDF/XML
data from SPARQL profile: Wikidata