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Let f: A B. (i) Show that if D C B then f (f-(D)) = Dn (ran f). (ii) Show that f is surjective

Let f: A B. (i) Show that if D C B then f (f-(D)) = Dn (ran f). (ii) Show that f is surjective if and only if f(f-'(D)) = D for all DC B. (iii) Show thatf is injective if and only if f-1((C)) = C for all C C A.

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