Functional Equation

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March 1st 2009, 12:06 PM
Winding Function

Functional Equation

Find all functions $f$ defined on nonnegative integers taking nonnegative integer values such that

$f(f(m) + f(n)) = m + n$

for all nonnegative integers $m, n$ .
March 2nd 2009, 01:34 PM
CaptainBlack

USA MTS 2008/9 problem, thread closed

CB

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