利用重合度理论中的延拓定理,获得了一类具有收获率和单调功能性反应的离散捕食系至少存在2个正周期解的充分条件.
By using a continuation theorem based on coincidence degree theory, sufficient conditions are obtained for the existence of at least two positive periodic solution for a class of discreted predator-prey system with harvesting and monotonic functional response.