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Four positive periodic solutions of a discrete time delayed predator-prey system with nonmonotonic functional response and harvesting. (English) Zbl 1165.34400
Summary: 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 predator-prey system with nonmonotonic functional response and harvesting.

##### MSC:
 34K13 Periodic solutions to functional-differential equations 92D25 Population dynamics (general)
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##### References:
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