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Homework Statement
Let A,B, and C be subsets of universal set U. Prove the following
A. If U=A union B and intersection of A and B is not an empty set, then A= U\B
B. A\(B intersection C) = (A\B) union (A\C)
Homework Equations
no relevant equations required
The Attempt at a Solution
A.
So I know A union B = {x: (xεA) or (xεB)}
But I am having trouble on where to go from there. Intuitively I can see that the claim is true, but how do I prove this? step by step please
B.
I know that B intersection C= : {x: (xεB) and (xεC)}
A\B = {x: (xεA) and ~(xεB)}
A\C = {x: (xεA) and ~(xεC)}
Same problem as part a how do I prove this?