olymmath

KöMaL 2017 A692

    Do there exist bijective functions f,g ⁣:Q→Qf,g\colon \mathbb{Q}\to\mathbb{Q} such that the function f(g(x))f\big(g(x)\big) is strictly increasing, but the function g(f(x))g\big(f(x)\big) is strictly decreasing?

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