Iterative roots of some functions

Authors: SUKRAWAN MAVECHA, VICHIAN LAOHAKOSOL, BOONROD YUTTANAN

Abstract: The iterative equation $f^{q}(x)=g(x)$, $x\in X$ for a given function $g$ and a positive integer $q$ is solved in the following two main cases: (i) $X=\mathbb{Z}$, $g(x)=ax+b$, ($a,b\in\mathbb{Z}$; $a\neq0,1$); (ii) $X=\mathbb{N}\cup\left\{ 0\right\} $, $g$ is increasing with no fixed point.

Keywords: Iterative functional equations, monotone functions, cycles

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