一类具有时滞和捕获的食物链模型的周期解

摘要

In this paper,we study a food chain model with time delay and harvesting term. By u-sing Ma whin's continuation theorem of coincidence degree theory, sufficient conditions which guarantee the existence of at least eight positive periodic solutions are obtained.%研究一类具有时滞和捕获的食物链模型,借助重合度理论中的Mawhin延拓引理,得到了保证系统至少存在8个正周期解的充分条件.