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2011 IMO Problems/Problem 3: Revision history

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27 November 2011

20 July 2011

  • curprev 16:2016:20, 20 July 2011 Humzaiqbal talk contribs 186 bytes +186 Created page with "Let f : R → R be a real-valued function defined on the set of real numbers that satisfies f(x + y) ≤ yf(x) + f(f(x)) for all real numbers x and y. Prove that f(x) = 0 for all..."
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