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Functional equation from SRMC

Source: 12th Silk Road Mathematical Competition SRMC2013 Probelm 3

April 7, 2013
functioninequalitiesalgebra unsolvedalgebra

Problem Statement

Find all non-decreasing functions f:NN f\,:\,\mathbb{N}\to\mathbb{N} , such that f(f(m)f(n)+m)=f(mf(n))+f(m)f(f(m)f(n)+m)=f(mf(n))+f(m)