About: http://dbpedia.org/resource/Category:Urelements

Property	Value
rdf:type	skos:Concept
rdfs:label	Urelements
skos:broader	dbpedia:Category:Set_theory
skos:prefLabel	Urelements
is skos:subject of	dbpedia:New_Foundations dbpedia:Urelement dbpedia:Axiom_of_extensionality dbpedia:Kripke–Platek_set_theory_with_urelements dbpedia:Scott–Potter_set_theory