Question 3. (a) Define precisely what it means for a function f : A → B to be injective. (b) For each of the following functions, determine whether or not the function is injective justifying your answers. (i) t : Z → Z, t(n) = n – 2020 (ii) u : P(N) → P(N), u(S) = S{1,2,3} (iii) s:C → C, s(z)= z² (iv) p : N x N → N, p(n,m) = n+m

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A: THE EXPLANATION HAS BEEN GIVEN IN THE ATTACHED FILE.

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