Claim:A ∩ B ⊆ A

From CS2800 wiki
[math]A \href{/cs2800/wiki/index.php/%E2%88%A9}{∩} B \href{/cs2800/wiki/index.php/%E2%8A%86}{⊆} \href{/cs2800/wiki/index.php?title=A&action=edit&redlink=1}{A} [/math]