Revision history of "2011 IMO Shortlist Problems/A6"

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  • (cur | prev) 05:46, 28 October 2013DANCH (talk | contribs). . (284 bytes) (+284). . (Created page with "Let <math>f: \mathbb R \to \mathbb R</math> be a real-valued function defined on the set of real numbers that satisfies <cmath> f(x + y) \le yf(x) + f(f(x)) </cmath> for all real...")