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(Solved): Exercise 3.4.3. Let A, B be two subsets of a set X, and let : X Y be a function. Show that ...



Exercise 3.4.3. Let A, B be two subsets of a set X, and let ƒ : X ? Y be
a function. Show that f(ANB) ? ƒ(A)Ñ ƒ(B), that ƒ(A)

Exercise 3.4.3. Let A, B be two subsets of a set X, and let ƒ : X ? Y be a function. Show that f(ANB) ? ƒ(A)Ñ ƒ(B), that ƒ(A)\ƒ(B) ? ƒ(A\B), ƒ(AUB) = ƒ(A) U ƒ(B). For the first two statements, is it true that the C relation can be improved to =?


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To show: . Let . Then there exists such that . By definition of intersection, gives that . Combining with , we get . Thus, . Since was arbitrary,
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