Home / All Definitions / Sets, Logics, & Proofs / Union Definition
Union (denoted by ∪) in set theory, of a collection of sets is the set of all elements in the collection. Union is one of the fundamental operations through which two or more sets can be combined and related to each other.
“Union (Set Theory).” Wikipedia, Wikimedia Foundation, 18 Apr. 2020, en.wikipedia.org/wiki/Union_(set_theory).
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