Advances in Difference Equations
Volume 2005 (2005), Issue 3, Pages 215-226
doi:10.1155/ADE.2005.215
Periodic solutions for a coupled pair of delay difference equations
Guang Zhang1
, Shugui Kang2
and Sui Sun Cheng3
1Department of Mathematics, Qingdao Technological University, Shandong, Qingdao 266033, China
2Department of Mathematics, Yanbei Normal University, Shanxi, Datong 037000, China
3Department of Mathematics, National Tsing Hua University, Hsinchu 300, Taiwan
Abstract
Based on the fixed-point index theory for a Banach space, positive periodic solutions are found for a system of delay difference equations. By using such results, the existence of nontrivial periodic solutions for delay difference equations with positive and negative terms is also considered.