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(2) Let f : A → A be a bijection. Suppose ∅ ⊂ S ⊆ A...

(2) Let f : A → A be a bijection. Suppose ∅ ⊂ S ⊆ A and f : S → S is also a bijection. Show that f is bijection f : (A − S) → (A − S).

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