考虑一类具有比率功能反应和脉冲的N-种群捕食系统,利用Mawhin延拓引理建立了这类系统周期解存在性的一个充分性判据.
The existence of periodic solutions for a class of impulsive N-species predator-prey system with ratiodependent functional response is studied. By using the continuation theorem based on coincidence degree theory, sufficient conditions of existence of positive periodic solutions of the system are established.