Question: 2. Suppose that f:X - Y is a function, and that D C X and E S Y. a) Prove that /(D ) = f(D).

 2. Suppose that f:X - Y is a function, and that

2. Suppose that f:X - Y is a function, and that D C X and E S Y. a) Prove that /(D ) = f(D). b) Prove that / (E) = F-(E)

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