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OpenStudy (anonymous):
Need to learn to write a proof for an iff statement. Such as If A and B are sets, then A U B = A , iff B is a subset of A. Assistance would be appreciated.
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OpenStudy (anonymous):
I know B has to be a subset of A because if it was not there would be some value in B that would not be in A this A U B would not equal A>
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