一类具有Beddington-DeAngelis功能反应的离散三种群食物链系统正周期解的存在性

Existence of positive periodic solution for a discrete three-species food-chain system with Beddington-DeAngelis functional response

利用重合度理论中的延拓定理讨论了具有Beddington-DeAngelis功能反应的离散三种群食物链系统正周期解的存在性问题,得到了保证正周期解存在的充分条件.

By using a continuation theorem based on coincidence degree theory, the existence of positive periodic solution of a discrete three - species food - chain system with Beddington-DeAngelis functional response is studied, a set of easily verifiable sufficient conditions are obtained.