In set theory and other branches of mathematics, the union of a collection of sets is the set that contains everything that belongs to any of the sets, but nothing else. This article uses mathematical symbols. Source: [wikipedia: union (set theory)]
faculty:university_of_vermont
United Academics -- AAUP/AFT
the union is affiliated with united professions of vermont (upv/aft), the american association of university professors (aaup), and the american federation of teachers (aft). information about the union and the benefits of having one.