Claim:Union computation

From CS2800 wiki
[math]\href{/cs2800/wiki/index.php/Enumerated_set}{\{1,2\}} \href{/cs2800/wiki/index.php/%E2%88%AA}{∪} \href{/cs2800/wiki/index.php/Enumerated_set}{\{2,3\}} = \href{/cs2800/wiki/index.php/Enumerated_set}{\{1,2,3\}} [/math]