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IMI/Publicaţii/BASM/Ediţii/BASM n.1(83), 2017/

Forbidden Set of the Rational Difference Equation xn+1 = xnxn-k/(axn-k+1 + xnxn-k+1xn-k)

Authors: Julius Fergy T. Rabago

Abstract

This short note aims to answer one of the open problems raised by F. Balibrea and A. Cascales in \cite{bc}. In particular, the forbidden set of the nonlinear difference equation $x_{n+1} = x_n x_{n-k}/(ax_{n-k+1} +x_n x_{n-k+1} x_{n-k})$, where $k$ is a positive integer and $a$ is a positive constant, is found by first computing the closed form solution of the given equation. Additional results regarding the limiting properties and periodicity of its solutions are also discussed. Numerical examples are also provided to illustrate the exhibited results. Lastly, a possible generalization of the present work is offered as an open problem.

Department of Mathematics and Computer Science
College of Science, University of the Philippines Baguio
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