共查询到20条相似文献,搜索用时 15 毫秒
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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. 相似文献
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In this article, we consider a class of control systems governed by the neutral stochastic functional differential equations with unbounded delay and study the approximate controllability of the system. An example is given to illustrate the result. 相似文献
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中立型泛函微分方程周期解问题 总被引:1,自引:0,他引:1
利用Fourier级数理论研究了一类k-阶线性中立型泛函微分方程周期解问题,给出了周期解存在唯一性的充要条件。利用此结果并结合Schauder不动点原理,进一步研究了一类k-阶非线性中立型泛函微分方程,得到了存在周期解的新的结果。这些结果改进和推广了近期文献中的已有结论。 相似文献
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On the Existence of Periodic Solutions for a Kind of Second Order Neutral Functional Differential Equation 总被引:4,自引:0,他引:4
ShiPingLU WeiGaoGE 《数学学报(英文版)》2005,21(2):381-392
By means of the continuation theorem of coincidence degree theory, some new results on the non-existence, existence and unique existence of periodic solutions for a kind of second order neutral functional differential equation are obtained. 相似文献
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一类二阶迭代泛函微分方程的解析解 总被引:4,自引:0,他引:4
本文研究了一类二阶迭代泛函微分方程x″(z)=mj=0pjxj(z),z∈C.其中m为正整数,xj(z)表示未知函数x(z)的j次迭代,给出了这类方程满足初始条件解析解的几个存在性定理. 相似文献
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应用Leray Schauder 不动点定理,研究了一类具变参数的p-Laplacian中立型泛函微分方程(φp(x′(t)-c(t)x′(t-r)))′=f(x′(t))+β(t)g(x(t-τ(t)))+e(t)的反周期解问题,得到了反周期解存在的新的结果. 相似文献
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多偏差变元中立型Rayleigh方程周期解问题 总被引:5,自引:0,他引:5
作者研究了一类多偏差变元中立型Rayleigh方程周期解问题,利用Mawhin重合度拓展定理得到了周期解存在性的新结果. 相似文献
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运用迭合度理论和分析的技巧,研究一类具分布时滞的中立型高阶泛函微分方程,并得到了其周期解存在的充分条件。 相似文献
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Shi Ping LU Wei Gao GE 《数学学报(英文版)》2005,21(6):1309-1314
Thc main aim of this paper is to use the continuation theorem of coincidence degree theory for studying the existence of periodic solutions to a kind of neutral functional differential equation as follows:(x(t)-^n∑i=1cix(t-ri))″=f(x(t))x′+g(x(t-τ))+p(t).In order to do so, we analyze the structure of the linear difference operator A : C2π→C2π, [Ax](t) =x(t)-∑^ni=1cix(t-ri)to determine some flmdamental properties first, which we are going to use throughout this paper. Meanwhile, we also prove some new inequalities which are useful for estimating a priori bounds of periodie solutions. 相似文献
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考虑了如下一类四阶P-Laplacian中立型泛函微分方程n n[″φp((μ(t)-μ(t-rj)j∑cj=1))]″=f(μ(t))μ′(t)+α(t)g(μ(t))+))+p(t)j∑βj(t)g(μ(t-γj(t)=1周期解的存在性.通过使用Mawhin重合度理论,得到了其周期解存在的充分性条件的新结果,改进和推广了已有结果. 相似文献
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一类二阶泛函微分方程周期解存在性问题 总被引:18,自引:0,他引:18
利用重合度理论研究一类二阶泛函微分方程x″(t)+f(t,x_t)x′~n+β(t)g(x(t-τ(t)))=p(t)的周期解问题,本文得到了周期解存在的新的结果。 相似文献
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A new second-order nonlinear neutral delay differential equation r(t) x(t) + P(t)x(t-τ) + cr(t) x(t)-x(t-τ) + F t,x(t-σ1),x(t-σ2),...,x(t-σn) = G(t),t ≥ t0,where τ 0,σ1,σ2,...,σn ≥ 0,P,r ∈ C([t0,+∞),R),F ∈ C([t0,+∞)×Rn,R),G ∈ C([t0,+∞),R) and c is a constant,is studied in this paper,and some sufficient conditions for existence of nonoscillatory solutions for this equation are established and expatiated through five theorems according to the range of value of function P(t).Two examples are presented to illustrate that our works are proper generalizations of the other corresponding results.Furthermore,our results omit the restriction of Q1(t) dominating Q2(t)(See condition C in the text). 相似文献
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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. 相似文献
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ZhengQiuZHANG ZhiChengWANG 《数学学报(英文版)》2005,21(1):95-108
We obtain sufficient conditions for the existence of periodic solutions of the following second order nonlinear differential equation:ax(t) bx^2k-1(t) cx^2k-1(t) g(x(t-T1),x(t-T2) ) = p(t) = p(t 2π)Our approach is based on the continuation theorem of the coincidence degree, and the priori estimate of periodic solutions. 相似文献
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Lei Yansong 《偏微分方程(英文版)》1990,3(3)
ln this peper we obtained the Hopf bifurcation theorem for an abstract functional differential equation by the results of [1]. The asymptotic expression of bifurcation formulae and stability condition were given in detail. Applying the result, we considered the Hopf bifurcation problem for a reaction-diffusion equation with time delay. 相似文献
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本文研究了一类一阶中立型泛函微分方程周期解的存在性问题.采用合适的算子并应用Leggett-Williams不动点定理,获得了该方程具有三个非负ω-周期解的充分条件 相似文献
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利用锥不动点定理研究一类非自治泛函微分方程的单重和多重正周期解的一种新的最优存在理论.对一些生物数学模型利用所建立的一般理论改进一些以前的结论并得到一些新的结论. 相似文献