Union (set theory)
OPERATION IN SET THEORY; UNION (DENOTED BY ∪) OF A COLLECTION OF SETS IS THE SET OF ALL DISTINCT ELEMENTS IN THE COLLECTION
Union (sets); Set theoretic union; Set union; Union (mathematics); Finite union; Finite unions; ∪; Union of sets; Infinite union; Infinite unions; Set-theoretic union; Union (math); ⋃; Union sign; Set theory union; Union set theory; Nullary union
In set theory, the union (denoted by ∪) of a collection of sets is the set of all elements in the collection. It is one of the fundamental operations through which sets can be combined and related to each other.