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《Journal of Tianjin Normal University(Natural Science Edition)》 2007-01
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Periodic Solution for a Predator-Prey System with Impulsive Effects and Delays

QIN Fa-jin1,OU Bo-qun2(1.Department of Mathematics,Liuzhou Teachers College,Liuzhou 545004,Guangxi Province, China;2.College of Mathematical and Computation Science,Zhanjiang Normal College,Zhanjiang 524048,Guangdong Province,China)  
A predator-prey system with impulsive effects is obtained by imposing external influence for ratio-based predator-prey system of two species.Periodic solution of the system under impulsive condition is obtained by using coincedence degree theory.By reasonably increasing the quantity of preys and decreasing the quantity of predators,a prior bound is obtained and a new Fredholm operator is defined.At last,a group of sufficient conditions for the existence of periodic solution is given.
【Fund】: 湛江师范学院基金项目(湛师L0402)
【CateGory Index】: O175
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