Question: Let f X- Y be an onto function, and let B be a subset of Y. Show that f(f(B)) = B. Give an example

Let f X- Y be an onto function, and let B be

Let f X- Y be an onto function, and let B be a subset of Y. Show that f(f(B)) = B. Give an example showing that equality need not hold if f is not and onto function.

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