Prove A = B of and only if $\displaystyle \sim A = \sim B $

Is the first step assume $\displaystyle x \epsilon A $ ????

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- Mar 22nd 2010, 09:21 AMtigergirlProving two sets are equal
Prove A = B of and only if $\displaystyle \sim A = \sim B $

Is the first step assume $\displaystyle x \epsilon A $ ????