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• 17:26, 4 July 2023 Admin talk contribs deleted page Pi-system (content was: "{{Short description|Family of sets closed under intersection}} {{this|{{pi}}-system in mathematics|{{pi}}-systems in chemistry|pi bond}} In mathematics, a '''{{pi}}-system''' (or '''pi-system''') on a set <math>\Omega</math> is a collection <math>P</math> of certain subsets of <math>\Omega,</math> such that * <math>P</math> is non-empty. * If <math>A, B \in P</math> then <math>A \cap B \in P.</math> That is, <math...")
• 17:24, 7 June 2023 Manidh talk contribs imported Pi-system by file upload (1 revision)