Positive periodic solutions of first-order singular systems
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摘要
We establish a complete structure for the existence of positive periodic solutions of first-order non-autonomous singular systemui′(t)=-ai(t)ui(t)+λbi(t)fi(u(t)),i=1,…,n.The methods employed are fixed point index theorems, Leray–Schauder degree and lower and upper solutions method.
论文关键词:First-order non-autonomous singular systems,Positive periodic solutions,Fixed point index,Leray–Schauder degree,Lower and upper solutions method
论文评审过程:Available online 14 June 2012.
论文官网地址:https://doi.org/10.1016/j.amc.2012.05.031