摘要
本文对LadasG在第二次国际差分方程会议上提出的一个公开问题进行了研究，获得了方程解的有界保持性的几个充分条件；文中的结果部分地解决了此公开问题．
篒n this paper we investigate an open problem given by Ladas G at the Second In-ternational Conference on difference equations and obtain several sufficient conditions for the boundedness and persistence of the solutions of the difference equations. The restult presented here can provide a partial solution to the problem.
关键词
时滞差分方程
有界保持性
解
差分方程
delay difference equation
boundedness and persistence
invariant
p-periodic solution
