Track / Stage 7 / 267 of 300 #2147 of 2444
Problem 2147
National Olympiad second round; IMO P1/P4 Algebra Difficulty 7.8 Find the answer USAMO
Let R>0 be the set of all positive real numbers. Find all functions f:R>0→R>0 such that for all x,y∈R>0 we have f(x)=f(f(f(x))+y)+f(xf(y))f(x+y).
A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.
Next problem →
Official solution
Source: Omni-MATH,
licensed Apache-2.0.
Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.