Mohammad Descartes
Posts : 100 Join date : 2009-11-05 Age : 40 Location : Right behind you
| Subject: 23rd Iranian Mathematical Olympiad 2008 Tue Feb 23, 2010 4:12 pm | |
| Find all functions f:R^+ to R^+, such that for all x,y \in R^+ we have (x+y)f(f(x)y)=x^2f(f(x)+f(y)), where R^+ denotes the set of positive real numbers. | |
|