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In set theory, the union of a collection of sets is the set of all the elements of all the sets of the collection. It is denoted as $ A \cup B $.

Formal DefinitionEdit

Let $ A $ be a set.

Let $ B $ be a set.

Then, the union of $ A $ and $ B $ is defined as: $ A \cup B = \{ x | x \in A \lor x \in B \} $

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