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A delayed three-species ratio-dependent predator-prey food-chain model without dominating instantaneous negative feedback is investigated. It is shown that the system is permanent under some appropriate conditions, and sufficient conditions are obtained for the local asymptotic stability of a positive equilibrium of the system. 相似文献
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具p-Laplace算子的四阶三点边值问题的两个正解 总被引:1,自引:0,他引:1
研究下列具有p-Laplace算子的四阶三点边值问题(p(u″(t)))″+a(t)f(u(t))=0,t∈(0,1),u(0)=ξu(1),u′(1)=ηu′(0),(p(u″(0))′=α1(p(u″(δ))′,p(u″(1))=β1(p(u″(δ)),通过利用Avery-Henderson不动点定理,给出了边值问题存在至少两个正解的充分条件. 相似文献
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1IntroductionItisknownthatmethodsofmathematicalmodelcanbeusedtodescribethedynamicalbehavioramongspeciesinecology.Recentlyman... 相似文献
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