J. Korean Math. Soc. 2005; 42(2): 255-268
Printed March 1, 2005
Copyright © The Korean Mathematical Society.
Mariette R. Maroun and Youssef N. Raffoul
Baylor University, University of Dayton
We use Krasnoselskii's fixed point theorem to show that the nonlinear neutral difference equation with delay \begin{equation} x(t+1) = a(t)x(t)+ c(t)\Delta x(t-g(t))+ q\big(t, x(t), x(t-g(t)\big)\nonumber \end{equation} has a periodic solution. To apply Krasnoselskii's fixed point theorem, one would need to construct two mappings; one is contraction and the other is compact. Also, by making use of the variation of parameters techniques we are able, using the contraction mapping principle, to show that the periodic solution is unique.
Keywords: Krasnoselski, contraction, nonlinear neutral difference equation, periodic solutions, unique solution
MSC numbers: 39A10, 39A12
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