• KingGeorge
[SOLVED by @eliassaab] Define a function $$f: \mathbb{Z}^+ \longrightarrow \mathbb{Z}^+$$ such that $$f$$ is strictly increasing, $$f$$ is multiplicative, and $$f(2)=2$$. Show that $$f(n)=n$$ for all $$n$$.
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