Question: 9. Let f : A B, D A and E B. Prove the following(s): (a) D f^ 1 (f (D)) (b) f (f^ 1 (E))

9. Let f : A B, D A and E B. Prove the following(s):

(a) D f^ 1 (f (D))

(b) f (f^ 1 (E)) E

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