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• 14:23, 5 July 2023 Admin talk contribs deleted page Filter (set theory) (content was: "{{short description|Family of sets representing "large" sets}} {{for|filters on a poset|Filter (mathematics)}} {{other uses|Filter (disambiguation)}} {{Very long|date=March 2023}} In mathematics, a '''filter''' on a set <math>X</math> is a family <math>\mathcal{B}</math> of subsets such that: {{sfn|Jech|2006|p=73}} # <math>X \in \mathcal{B}</math> and <math> \emptyset \notin \mathcal{B}</math> # if <math>A\in \mathcal{B}</math> and <math>B \in \mathca...")