本文在时标上运用迭合度理论中的Gaines和Mawhin连续性定理研究了一类非自治捕食系统的周期解的存在性,得到了此模型周期解存在的充分条件,该方法可将证明连续和离散微分方程的周期解的存在性统一起来.
In this paper,the existence of periodic solutions to a non-autonomous predator-prey system is investigated by using the Gaines and Mawhin's continuation theorem of coincidence degree theory on time scales.New sufficient conditions are obtained for the existence of periodic solutions.The approach is unified to provide the existence of the desired solutions for the continuous differential equations and discrete difference equations.