The answer to exercise marked [BB] can be found in the Back of the Book.
Define ƒ: N \ {1} → N by setting ƒ(n) equal to the largest prime divisor of n.
(a) Find the range of ƒ.
(b) Is ƒ one-to-one?
(c) Is ƒ onto?
(d) Why did we not express ƒ as a function N → N?
Explain your answers.
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