使用Mawhin重合度理论的连续性定理和拓扑度理论,对脉冲条件下具周期时滞的竞争模型进行研究,得到了该模型周期正解存在的充分必要条件.%Using the continuation theorem of coincidence degree theory proposed by Mawhin and topological degree. theory to study the periodic solutions of a competition model governed by impulsive differential equations with periodic delays and sufficient and necessary condition of existence of positive periodic solution for the system is obtained.
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