хөдөлгөөнт бутлуурын тоос шүүлтүүр
filterWiktionary mathematics order theory A non empty upper set of a partially ordered set which is closed under binary infima a k a meets The collection of cofinite subsets of ℝ is a filter under inclusion it includes the intersection of every pair of its members and includes every superset of every cofinite set If 1 the universal set here the set of natural numbers were called a large
