J4 ›› 2010, Vol. 48 ›› Issue (06): 893-898.

• 数学 • 上一篇    下一篇

具无限时滞的Lotka-Volteraa三种群互惠系统的持久性与周期性

郭微1,2, 程荣福1   

  1. 1. 北华大学 数学学院, 吉林 吉林 132013|2. 吉林大学 数学研究所| 长春 130012
  • 收稿日期:2010-03-10 出版日期:2010-11-26 发布日期:2010-11-26
  • 通讯作者: 郭微 E-mail:guoweijilin@163.com

Periodicity and Permanence of LotkaVolteraa Three SpeciesCooperative System with Infinite Delay

GUO Wei1,2, CHENG Rongfu1   

  1. 1. College of Mathematics, Beihua University, Jilin 132013, Jilin Province, China;2. Institute of Mathematics, Jilin University, Changchun 130012, China
  • Received:2010-03-10 Online:2010-11-26 Published:2010-11-26
  • Contact: GUO Wei E-mail:guoweijilin@163.com

摘要:

研究具有无限时滞的非自治LotkaVolteraa三种群模型, 该系统三种群具有互惠关系. 利用微分方程比较定理, 得到了该系统持久性的充分条件; 利用重合度理论中的延拓定理, 得到了该系统正周期解存在性的充分条件.

关键词: 互惠系统, 持久性, 重合度理论, 正周期解

Abstract:

This paper deals with a nonautonomous LotkaVolteraa three species system with three species cooperative and infinite delay. The sufficient condition for the permanence of the system was obtained  by means of  differential equation comparability theorem;   the sufficient condition for the existence of positive periodic solution  of the system was obtained with the aid of  continuation theorem based on coincidence degree theory.

Key words: cooperative system, persistence, continuation theorem, positive periodic solution

中图分类号: 

  • O175.14