Advances in Difference Equations
Volume 2008 (2008), Article ID 247071, 11 pages
Existence Theorems of Periodic Solutions for Second-Order Nonlinear Difference Equations
1College of Statistics, Hunan University, Changsha, Hunan 410079, China
2College of Mathematics and Information Science, Guangzhou University, Guangzhou 510405, China
Received 14 August 2007; Accepted 14 November 2007
Academic Editor: Patricia J. Y. Wong
Copyright © 2008 Xiaochun Cai and Jianshe Yu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The authors consider the second-order nonlinear difference equation of the type using critical point theory, and they obtain some new results on the
existence of periodic solutions.