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3. For each of the following functions prove that f is injective or explain why f is not injective. Do the same for surjective. (a)

3. For each of the following functions prove that f is injective or explain why f is not injective. Do the same for surjective. (a) f : N - N, f(n) = n (b) f : Z - Z, f(2) = 22 (c) f : R - R, f(r) =r2 (d) f : C - C, f(c) =c2

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