ultrafilter
构词拆解
- ultra-
- Greater than normal quantity or importance, as in ultrasecret. · Beyond, on the far side of, as in ultraviolet.
词源说明
释义
名词noun
- 1A device that performs ultrafiltration.
- 2(mathematics, of a set, whose subsets are partially ordered by inclusion) A proper filter which has a law of dichotomy for complements.
- 3(mathematics, order theory) A filter (subset of a poset) that is maximal as a set with respect to the definition of proper