# Union (set theory)

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**Union (set theory)**as edited by JimFullerton (Talk | contribs) at 14:05, 6 February 2011. This URL is a permanent link to this version of this page.A **union** of two or more sets is formed by choosing all the elements that belong to at least one of the sets.

## Mathematical Definition

A∪B = {x:x∈A or x∈B}