Union
The union of several sets is the set which contains all the elements of each of the given sets. The union of sets and is denoted .
For example, and and .
For any sets and , and . It follows that if and only if .
The union of several sets is the set which contains all the elements of each of the given sets. The union of sets and is denoted .
For example, and and .
For any sets and , and . It follows that if and only if .
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