Question: Give an example of a function f: A B and A1, A2 A for which f(A1 A2) f(A1) (A2). [Thus

Give an example of a function f: A → B and A1, A2 ⊂ A for which f(A1 ∩ A2) ≠ f(A1) ∩ (A2). [Thus the inclusion in Theorem 5.2(b) may be proper.]

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