Difference between revisions of "2011 IMO Problems"

Revision as of 17:19, 20 July 2011 (view source) Humzaiqbal (talk \| contribs) (added text)		Revision as of 17:22, 20 July 2011 (view source) Humzaiqbal (talk \| contribs) (Blanked the page) Newer edit →
Line 1:		Line 1:
−	~~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 x≤ 0.~~

Page