ultrafilter (plural ultrafilters)
A device that performs ultrafiltration.
(mathematics, of a set, whose subsets are partially ordered by inclusion) A proper filter which has a law of dichotomy for complements.
(mathematics, order theory) A filter (subset of a poset) that is maximal as a set with respect to the definition of proper filter.
• filter
• free ultrafilter
• principal ultrafilter
• poset
Source: Wiktionary
9 January 2025
(noun) (obstetrics) position of the fetus in the uterus relative to the birth canal; “Cesarean sections are sometimes the result of abnormal presentations”
The earliest credible evidence of coffee-drinking as the modern beverage appeared in modern-day Yemen. In the middle of the 15th century in Sufi shrines where coffee seeds were first roasted and brewed for drinking. The Yemenis procured the coffee beans from the Ethiopian Highlands.
