Suppose f : A → B is a function, X ⊂ A and Y ⊂ B. What does it mean to say: (a) z is in the range of f? (b) The function f is one-to-one? (c) The function f is onto? (d) That z ∈ f^(−1)(Y )? (e) That z ∈ f(X)?

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A:

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