Question: About functions and sets, Let X and Y be sets, A, B X, and f: X-->Y Prove that if A B, then f[A] f[B] Given

About functions and sets,

Let X and Y be sets, A, BX, and f: X-->Y

Prove that if AB, then f[A]f[B]

Given an example of sets X and Y, subsets A, BX, and f: X-->Y such that f[A]f[B], but AB

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