olymmath

RMM 2013 Problem 2

  • Day 1

Does there exist a pair (g,h)(g, h) of functions g,h:R→Rg, h: \mathbb{R} \rightarrow \mathbb{R} such that the only function f:R→Rf: \mathbb{R} \rightarrow \mathbb{R} satisfying f(g(x))=g(f(x))f(g(x))=g(f(x)) and f(h(x))=h(f(x))f(h(x))=h(f(x)) for all x∈Rx \in \mathbb{R} is the identity function f(x)≡xf(x) \equiv x ? (United Kingdom) Alexander Betts

Dataset text NuminaMath olympiads. Quoted with source.

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