Electronic Journal of Differential Equations,
Vol. 2006(2006), No. 03, pp. 1-18.

Title: Existence of positive periodic solutions for a class of
       nonautonomous difference equations
       
Author: Zhijun Zeng (Chinese Academy of Sciences, Beijing, China)

Abstract: 
 In this article, we investigate the existence of positive
 periodic solutions for a class of non-autonomous difference
 equations. Using the Krasnoselskii fixed point theorem,
 we establish  sufficient criteria that are easily verifiable
 and that generalize and improve related studies in the literature.
 Numerical simulations are presented which support our theoretical
 results for some concrete models.
 
Submitted October 25, 2005. Published January 6, 2006.
Math Subject Classifications: 34K45, 34K13, 92D25.
Key Words: Nonautonomous difference equations; periodic solution;
           Krasnoselskii fixed point theorem; numerical simulations.