## 11. Three ways to attack a functional equation

October 19, 2008 by compactorange

Hi everyone. PEN is BACK. Here goes the first problem of the second season!

11. PEN K11 (Canada 2002) Find all functions such that for all

:

Here, denote the set of all nonnegative integers.

This problem is suggested by **Alexander Remorov** from Canada. Next week, his solution will be posted!

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