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• 14:03, 5 July 2023 Admin talk contribs deleted page Ring of sets (content was: "{{Short description|Family closed under unions and relative complements}} {{distinguish|Ring (mathematics)}} In mathematics, there are two different notions of a '''ring of sets''', both referring to certain families of sets. In order theory, a nonempty family of sets <math>\mathcal{R}</math> is called a ring (of sets) if it is closed under union and intersection.<ref...")