二阶时滞微分方程周期边值问题正解的三解定理

利用Leggett—Williams不动点定理，研究了二阶时滞微分方程边值问题 {y＂（t）＋f（t,y（t-τ））=0,0〈t〈2π； y（t）=0,-τ≤t≤0; y（0）=y（2π） 正解的存在性．其中0〈r〈π/2为一常数．我们先建立了该问题至少存在两个正解的充分条件．接着给出其至少存在三个正解的存在定理．     

The existence of positive solutions of the nonlinear neutral differential equations in a Banach space

1.IntroductionTheexistenceanduniquenessofsolutionsofdelaydifferentialequationsinaBanachspacehavebeenstudiedbymanyauthors(see[1--4]).Inthispaper,weshallapplythefixedpoillttheoremstoinvestigatetheexistenceofpositivesolutionsofnonlinearneutraldifferentialdifferenceequationsinaBanachspace.LetRbethefieldofrealnumbers,andletR ={tERIt20},to>0,J=[to, co)'ConsiderthenonlinearneutraldifferentialdifferenceequationinaBanachspaceE.mI(x(t)~Zci(t)x(t~ri))' ZPj(t)fj(x(t~D))=0,(1)i=1j=1wherefiEC[P,PI,f…     

具有混合单调性的脉冲微分方程解的存在性

利用混合单调算子的不动点定理,讨论了一类二阶脉冲微分方程两点边值问题,得到了存在唯一正解的充分条件,此外给出了相应的例子.     

Positive solutions for boundary value problem of nonlinear fractional differential equation

In this paper, we investigate the existence and multiplicity of positive solutions for nonlinear fractional differential equation boundary value problem:

     

Existence of multiple positive periodic solutions for functional differential equations

In our paper, by employing Krasnoselskii fixed point theorem, we investigate the existence of multiple positive periodic solutions for functional differential equations

     

依赖于一阶导数的(n-1,1)共轭m点边值问题正解的存在性

利用锥上的Krasnoselskii's不动点定理的推广定理,讨论了一类边值问题,给出了相应依赖于一阶导数的非线性n阶m点边值问题至少一个正解的存在性．对于n阶m点边值问题,给出了相应的Green函数,证明了在非线性项f满足一定的增长条件下至少存在1个正解．并且给出了一个例子来说明所获得的结果．     

A Note on a Functional Differential Equation with State Dependent Argument

This paper is concerned with solutions of a functional differential equation.Using Krasnoselskii's fixed point theorem,the solutions can be obtained from periodic solutions of a companion equation.     

Positive Periodic Solution for a Nonautonomous Delay Differential Equation

In this paper, by using the Krasnoselskii fixed point theorem, we study the existence of one or multiple positive periodic solutions of a nonautonomous delay differential equation. We also give some examples to demonstrate our results.     

Positive solutions of singular Caputo fractional differential equations with integral boundary conditions

In this paper, we investigate the existence of positive solutions of singular super-linear (or sub-linear) integral boundary value problems for fractional differential equation involving Caputo fractional derivative. Necessary and sufficient conditions for the existence of C³[0, 1] positive solutions are given by means of the fixed point theorems on cones. Our nonlinearity f(t, x) may be singular at t = 0 and/or t = 1.     

一类次线性分数微分方程的正解存在性

证明了一类非线性项受幂函数控制的次线性分数微分方程的正解存在性.主要方法是锥拉伸与锥压缩型的Krasnosel’skii不动点定理的局部应用.我们的结论表明该方程可以具有一个正解,只要非线性项在某个有界集上的“高度”是适当的.     

二阶中立型泛函微分方程的周期解

考虑如下一类二阶中立型泛函微分方程的周期解:u″(t)-cu″(t-δ)+a(t)u(t)=λf(t,u(t-τ(t))),其中,λ>0为参数,c和δ为常数.通过应用Krasnoselskii锥不动点定理及一些分析技巧给出了这类方程周期正解的存在性非存在性和多解性.     

非自治时滞微分方程正周期解的存在性

应用Krasnoselskii锥映射不动点定理,研究了具一般时滞非线性非自治Logistic方程的ω-周期解的存在性,获得了存在正周期解的充分条件．     

具参数的非线性中立泛函微分方程三个反周期解的存在性

本文考虑一类具参数的非线性中立泛函微分方程,利用Leggett-Williams不动点定理得到该方程三个反周期解的存在充分条件.     

带有双参数的脉冲泛函微分方程正周期解的存在性

考虑一类带有双参数的脉冲泛函微分方程,利用锥上不动点定理,得到了方程存在正周期解的若干充分条件,推广和改进了相关文献中的某些结果.