Definition:Union

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Definition: Union
If [math]A [/math] and [math]B [/math] are sets, then the union of [math]A [/math] and [math]B [/math] (written [math]A \href{/cs2800/wiki/index.php/%5Ccup}{\cup} B [/math]) is given by [math]A \cup B \href{/cs2800/wiki/index.php/Definition}{:=} \{x \href{/cs2800/wiki/index.php/%5Cmid}{\mid} x \href{/cs2800/wiki/index.php/%5Cin}{\in} A \href{/cs2800/wiki/index.php/Or}{\text{ or }} x \href{/cs2800/wiki/index.php/%5Cin}{\in} B\} [/math].