本文研究一类具Beddington-DeAngeli类功能性反应和脉,中的多种群竞争一捕食系统,运用Gaines和Mawhin’s的重合度理论给出系统存在正周期解的一个充分条件.
In this paper, we consider a nonantonomous mutispecies ecological competitionpredator system with impulsive effect and Beddington-DeAngelis fuctional responses .A sufficient condition is established for existence of positive periodic solution of the system by using the theory of coincidence degree.