Definitions from Wiktionary (ultrafilter)

▸ noun:  A device that performs ultrafiltration.
▸ noun:  (mathematics, of a set, whose subsets are partially ordered by inclusion) A proper filter which has a law of dichotomy for complements.
▸ noun:  (mathematics, order theory) A filter (subset of a poset) that is maximal as a set with respect to the definition of proper filter.
▸ verb:  (transitive) To filter by ultrafiltration.




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