摘要
本文利用重合度理论的延拓定理及分析的技巧讨论了具有两个捕获项的比率依赖型食物链系统周期解的存在性问题,得到至少存在四个周期解的充分条件.
By using the coincidence degree theory and the related continuation theorem, as well as some analysis techniques,we investigate the existence of positive periodic solutions of ratio-dependent food chain model with two exploited terms. Some sufficient criteria are established for the existence of periodic solutions.
出处
《应用数学》
CSCD
北大核心
2011年第3期631-640,共10页
Mathematica Applicata
基金
教育部高等学校博士点基金(20090043120009)
国家大学生创新性实验计划项目(091020024)
关键词
重合度
比率依赖型
捕获项
周期解
Coincidence degree
Ratio-dependent
Exploited term
Periodic solution
