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Definition

union symbol

The union symbol ( ) denotes the union of two set s. It is commonly used in mathematics and engineering. Given two sets A and B, the union of A and B, written A B, is the set C of all elements that are in A or in B.

The diagram below illustrates set union. Sets A and B are denoted as circles (including their interiors). The set A B is represented by the entire shaded region.

Compare intersection symbol .

Also see Mathematical Symbols .

This was last updated in September 2005

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