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In set theory, the union of two sets $ A,B $ is the set of all elements in $ A $ , in $ B $ , or both.

Definition

Given two sets $ A,B $ ,
$ A\cup B=\{x|x\in A\or x\in B\} $

Example

Suppose $ A=\{w,x,y\} $ and $ B=\{t,x,z\} $ :

$ A\cup B=\{t,w,x,y,z\} $

See also

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