function equation from R+->R+
Source: Argentina IMO TST 2008
September 9, 2008
Problem Statement
-Find all the functions from \mathbb R^\plus{} \to \mathbb R^\plus{} that satisfy:
x^2(f(x)\plus{}f(y))\equal{}(x\plus{}y)(f(yf(x)))
Source: Argentina IMO TST 2008