Prove A and B are is disjoint if and only if $\displaystyle \sim A \cup \sim B$= the universal set.
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Originally Posted by tigergirl Prove A and B are is disjoint if and only if $\displaystyle \sim A \cup \sim B$= the universal set. Is this true $\displaystyle x \notin \left( { \sim A~ \cup \sim B} \right) \Rightarrow \quad x \in A \wedge x \in B ?$
yes...so this means that they are equal
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