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###### Points) Let f : A=B be function. Prove thatJ is injectivef-I(f(C)) = C for any subset C of A Hint: Note that it C â‚¬ f-I(f(C)) is true for any C â‚¬ A (from leetures) . Consider using the contraposition for the direction

points) Let f : A=B be function. Prove that J is injective f-I(f(C)) = C for any subset C of A Hint: Note that it C â‚¬ f-I(f(C)) is true for any C â‚¬ A (from leetures) . Consider using the contraposition for the direction

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