一类三阶微分方程组多点边值问题解的存在性

利用拓扑度理论和上下解方法讨论了一类三阶微分方程组{x′′′(t)+f1(t,y(t),x′(t),x″(t))=0,0≤t≤1,y′′′(t)+f2(t,x(t),y′(t),y″(t))=0,0≤t≤1在适当的条件下解的存在性.

三阶微分方程组非局部边值问题多个正解的存在性

利用Leggett--Williams不动点定理,研究下列三阶微分方程组边值问题{u′″(t)+a_1(t)f_1(t,u(t),v(t))=0,0<t<1,v′″(t)+a_2(t)f_2(t,u(t),v(t))=0,0<t<1,u'(0)=u″(0)=0,u(1)=g_1(∫_0~1u(s)dф_1(s),∫_0~1v(s)dф_1(s)),v'(0)=v″(0)=0,v(1)=g_2(∫_0~1u(s)dф_2(s),∫_0~1v(s)dф_2(s))多个正解的存在性,其中a_i∈C((0,1),[0,+∞)),f_i,g_i∈C([0,1]×[0,+∞)×[0,+∞)→[0,+∞)),∫_0~1u(s)dфi(s),∫_0~1v(s)dфi(s)是Riemann-Stiltjes积分,i=1,2.

一类三阶微分方程组边值问题特殊正解的存在性

利用锥拉伸锥压缩不动点定理,研究了微分方程组-u=f(t,u,v,w),-v=g(t,u,v,w),-w=h(t,u,v),u(0)=u'(0)=u″(1)=0,v(0)=v'(0)=v″(1)=0,w(0)=w'(0)=w″(1)=0边值问题在某些条件下特殊正解的存在性.

一类三阶微分方程组三点边值问题正解的存在性

利用乘积锥上的不动点指数定理,研究了一类三阶微分方程组三点边值问题正解的存在性。

三阶微分方程组边值问题常号解的存在性

利用Krasnoselskii不动点定理,结合Leray-Schauder度,研究下列三阶微分方程组边值问题在某些条件下,常号解的存在性和多解性.

三阶非线性微分方程组边值问题的正解

讨论了以下三阶非线性微分方程组{-u′′′(x)=f(x,v),-v′′′(x)=g(x,u),x (0,1),u(0)=0,αu′(0)-βu″(0)=0,γu′(1)+δu″(1)=0,v(0)=0,αv′(0)-βv″(0)=0,γv′(1)+δv″(1)=0.在假设条件下,利用锥拉伸与锥压缩不动点定理获得了上述方程组正解的存在性.

三阶常系数线性齐次微分方程组新探

本文给出了三阶常系数线性齐次微分方程组可化成与之等价的三阶常系数线性齐次微分方程的充要条件及几个有益的结果,并获得了三阶常系数线性齐次微分方程组的一种简便解法.

一类三阶非线性方程组的两点边值问题

研究一类三阶非线性方程组的两点边值问题,利用微分不等式理论给出了解的存在性,结果表明所用技巧可以被应用到其它相应的边值问题.

On the Existence of Periodic Solutions for Third Order Non-Dissipative Differential Systems

In this paper we first obtain Some fixed point theorems and then app- ly them to a third-order periodically perturbed non-dissipative systems, conditions on the existence of multiple periodic solutions are given。 Fina- lly,an example of application is cited.

Positive Solutions of Boundary Value Problem for a Coupled System of Nonlinear Third-order Differential Equations

By using cone expansion-compression theorem in this paper, we study boundary value problems for a coupled system of nonlinear third-order differential equation. Some sufficient conditions are obtained which guarantee the boundary value problems for a coupled system of nonlinear third-order differential equation has at least one positive solution. Some examples are given to verify our results.