12. Subset filters
In a non-empty set E, subset filters are exactly filters in the sense of ordered set theory, where the relevant order relation is defined by the ensemblistic inclusion .
12.1 Filters
Definition (subset filter (Cartan (1937)). Let E be a non-empty set. A subsetfilter of E, denoted , is a stack of non-empty subsets of E satisfying the axiom ...
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Subset filters
Subset ideals
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