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  3. 0428 let f x y be a function...

Question: 0428 let f x y be a function...

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(0.4.28) Let f : X → Y be a function. A c X and B-Y. (a) Is f(f(A)) A? Always, sometimes, never? Explain. (b) Is f (f-B B? Always, sometimes, never? Explain.
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