Four positive periodic solutions of a discrete time delayed predatorprey system with nonmonotonic functional response and harvesting ?
In this paper, by employing the continuation theorem of coincidence degree theory, we establish an easily verifiable criteria for the existence of at least four positive periodic solutions for a discrete time delayed predatorprey system with nonmonotonic functional response and harvesting.
four positive periodic solutions nonmonotonic functional response harvesting continuation theorem of coincidence degree theory predator-prey system