Question: #20. Let R be a relation from A to B. Prove that for all subsets A1 and A2 of A R (Al n A2)-R (A)

#20. Let R be a relation from A to B. Prove

that for all subsets A1 and A2 of A R (Al n

#20. Let R be a relation from A to B. Prove that for all subsets A1 and A2 of A R (Al n A2)-R (A) n R(Ag) if and only if R (a) n R(b)for any distinct a, b, in A

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