二阶非共振半正边值问题正解的存在性

通过将微分方程化为积分方程组,并利用锥上的不动点指数定理,研究了一类二阶边值问题正解的存在性, 其中不要求非线性项$f(t,u)$非负,得到了其正解存在的一个定理.     

奇异二阶泛函微分方程边值问题的多重正解

本文把ＺｈａｏｌｉＬｉｕ和Ｅｒｂｅ等人关于常微分方程边值问题多重正解的工作推广到二阶奇异混合型泛函微分方程边值问题,证明了所考虑的方程边值问题存在至少两个正解的充分条件。     

POSITIVE SOLUTIONS OF PERIODIC BOUNDARY VALUE PROBLEM FOR SECOND ORDER DIFFERENTIAL SYSTEMS

In this paper, by utilizing a fixed point theorem on cone in Banach space, the author disscusses the periodic boundary value problem of second order differential systems. Some results on the existence of positive solutions are derived.     

POSITIVE SOLUTION OF SECOND ORDER SINGULAR BOUNDARY VALUE PROBLEM

The paper deals with the existence of positive solutions of the singular equation u" f(t, u) = 0 with the linear boundary condition. We obtain the existence results of positive solution by means of the cone theory and the fixed point index.     

POSITIVE SOLUTIONS TO SINGULAR SECOND ORDER PERIODIC BOUNDARY VALUE PROBLEM WITH SIGN-CHANGING NONLINEARITIES

This paper deals with the existence of positive solutions to the singular secondorder periodic boundary value problem. We obtain the existence results of positive solutions by the fixed point index theory. The results obtained extend and complement some known results.     

二阶奇异边值问题两个非负解的存在性

利用拓扑度理论,给出了边值问题ｕ″（ｔ）＋λａ（ｔ）ｆ（ｕ（ｔ））＝０,０〈ｔ〈１,ａｕ（０）－βｕ’（０）＝０,γｕ（１）＋δｕ’（１）＝０两个非负解的存在性结果,这里允许ａ在ｔ＝０和ｔ＝１处有奇性。     

二阶微分方程边值问题的多重正解

基于Leray-Schauder度理论和上下解方法讨论非线性边值问题(t)+g(t,y)=0,(0)=0,y(1)=b≥0的正解存在性,其中g局部Lipschitz连续,g(t,0)≥0,但是可以是变号函数。主要结论是:如果g(t,y)在y=+∞满足一个超线性增长条件,并且存在使得β(1)>0的非负上解β,则存在正数B使得当0B时,不存在正解。     

二阶奇异初值问题正解

应用不动点定理和逼近方法,研究了二阶非线性奇异初值问题正解的存在性,获得了若干新结果。     

Sturm-Liouville方程奇异边值问题的正解

本文利用不动点指数理论,讨论Sturm-Liouville方程(p(t)u'(t))'+g(t)F(t,u)=0 奇异边值问题的正解的存在性.     

带p-Laplacian算子的三阶微分方程边值问题三个正解的存在性

应用Avery-Peterson不动点定理,讨论了带p-Laplacian算子的三阶三点边值问题,当非线性项f满足一定增长条件时,得到了上述边值问题至少存在三个正解的充分条件.     

Banach空间中一类奇异脉冲微分方程边值问题多个正解的存在性

利用锥拉伸及锥压缩不动点定理,研究了Banach空间中一类带奇异性的脉冲微分方程边值问题多个正解的存在性.     

MULTIPLE POSITIVE SOLUTIONS OF A CLASS OF THREE-POINT SINGULAR NONLINEAR BOUNDARY VALUE PROBLEMS

In this paper, the existence theorem for three positive solutions is presented for the singular nonlinear boundary value problem by applying the extended Five Functionals fixed point theorem. singular nonlinear boundary value problem; positive solutions; cone; fixed point theorem     

POSITIVE SOLUTIONS OF SINGULAR SECOND-ORDER NEUMANN BOUNDARY VALUE PROBLEM

In this paper, we obtain the existence of positive solutions for singular second-order Neumann boundary value problem by using the fixed point indices, the result generalizes some present results.     

MULTIPLE POSITIVE SOLUTIONS TO SINGULAR BOUNDARY VALUE PROBLEMS FOR SUPERLINEAR SECOND ORDER ODES

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THE EXISTENCE OF POSITIVE SOLUTIONS TO BOUNDARY VALUE PROBLEM OF SECOND ORDER DIFFERENTIAL EQUATIONS

In this paper, a fixed point theorem in C1[0,1] space is established using the properties of the fixed point index. This theorem is applied to prove the existence of positive solution to the boundary value problems of second order differential equations.     

MULTIPLE POSITIVE SOLUTIONS OF BOUNDARY VALUE PROBLEMS FOR QUASILINEAR DIFFERENTIAL EQUATIONS

We consider the boundary value problem for the second order quasilinear differential equationwhere f is allowed to change sign, φ(v) = \v\p-2v, p > 1. Using a new fixed point theorem in double cones, we show the existence of at least two positive solutions of the boundary value problem.     

POSITIVE SOLUTIONS OF NONLINEAR FOURTH-ORDER SINGULAR BOUNDARY VALUE PROBLEMS

By constructing a special cone and using the fixed point theorem of cone expansion and compression,this paper investigates fourth-order singular boun- dary value problems with sublinear effect and presents some necessary and sufficient conditions for existence of C~2 or C~3 positive solutions.Further,some examples are given concerning the applications of our main results.     

一类n-阶m-点奇异边值问题的正解

研究n-阶m-点奇异边值问题其中h(t)允许在t=0,t=1处奇异,f(t,v_0,v_1,…,v_(n-2))允许在v_i=0(i=0,1,…,n-2)处奇异.利用锥拉伸与压缩不动点定理得到了上述奇异边值问题正解的存在性.     

POSITIVE SOLUTIONS TO BOUNDARY VALUE PROBLEMS OF FRACTIONAL DIFFERENTIAL EQUATIONS WITH PARAMETER

In this paper, we consider a class of nonlinear fractional differential equation boun- dary value problem with a parameter. By some fixed point theorems, sufficient con- ditions for the existence, nonexistence and multiplicity of positive solutions to the system are obtained. An example is given to illustrate the main results.     

MULTIPLE POSITIVE SOLUTIONS TO FOURTH-ORDER SINGULAR BOUNDARY VALUE PROBLEMS

In this paper,using the Krasnaselskii's fixed point theory in cones and localization method,under more general conditions,the existence of n positive solutions to a class of fourth-order singular boundary value problems is considered.