Four positive periodic solutions of a discrete time delayed predator-prey system with nonmonotonic functional response and harvesting
In this paper, by employing the continual ion 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 predator-prey system with nonmonotonic functional response and harvesting. (c) 2008 Elsevier Ltd. All rights reserved.
four positive periodic solutions predator-prey system nonmonotonic functional response harvesting continuation theorem of coincidence degree theory