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研究了Liénard方程的一类新的等价系统解的有界性与周期解的存在性.证明了几个比较定理,使传统Liénard方程等价系统解的有界性和周期解的存在性可用于判定新等价系统解的有界性与周期解的存在性. 相似文献
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本文研究Dalvey-Stewartson方程组的整体解与自相似解的存在性.首先,运用Ba- nach不动点定理得到一个关于解整体存在性的一般性定理,然后把一类特殊的初始值用到该存在性结果上去从而得到自相似解存在的结论. 相似文献
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讨论了一类带有扩散与时滞的流行性传染病模型的行波解的存在性.首先,将系统的行波解的存在性问题转化为一个二阶常微分方程组的单调解的存在性问题;应用单调方法和不动点方法,进一步地将问题转化为方程组的上下解的构造问题;应用所建立的引理与定理,通过构造适合的上下解,证明了系统单调行波解的存在性. 相似文献
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徐承龙 《数学年刊A辑(中文版)》1991,(4)
本文讨论一类无界区域中半线性椭圆型方程渐近解的存在性,包括最大解与最小解的存在性。最后讨论了存在最大解的必要条件,并得到了一个存在最大解的充要条件。 相似文献
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研究一类Klein-Gordon-Maxwell系统解的存在性和多重性.当非线性项是凹凸非线性项时,利用变分方法获得了系统解的存在性和多重性结果,并完善了此系统解的存在性的已有结果. 相似文献
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该文研究Hopfield神经网络概周期解的存在性和全局吸性,获得了该网络存在唯一概周期解的充分条件和所有解收敛于此概周期解的充分条件。 相似文献
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运用Krasnosel’skii不动点理论研究了一类含参泛函微分方程半正问题正周期解的存在性.获得了当参数充分小时正周期解的存在性结果以及半正问题正周期解存在的充分条件.丰富了一阶泛函微分方程解的存在性理论. 相似文献
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主要研究平衡问题解的存在性.通过对目标函数和可行集合的渐近分析,给出拟单调平衡问题解集非空的条件.进而用类似的方法研究了向量平衡问题解存在的条件,并将其应用到向量优化问题上. 相似文献
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This work investigates the existence of globally Lipschitz continuous solutions to a class of initial-boundary value problem of quasilinear wave equations. Applying the Lax's method and generalized Glimm's method, we construct the approximate solutions of initial-boundary Riemann problem near the boundary layer and perturbed Riemann problem away from the boundary layer. By showing the weak convergence of residuals for the approximate solutions, we establish the global existence for the derivatives of solutions and obtain the existence of global Lipschitz continuous solutions of the problem. 相似文献
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《Journal of Computational and Applied Mathematics》1998,88(1):71-78
We study the existence of positive solutions of a nonlinear eigenvalue problem for a two-point boundary-value problem for a family of second-order disfocal ordinary differential equations. We apply a cone-theoretic fixed-point theorem and obtain both sufficient conditions for the existence of positive solutions and sufficient conditions for the existence of multiple positive solutions. 相似文献
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Study of weak solutions for a fourth-order parabolic equation with variable exponent of nonlinearity
The aim of this paper is to study the existence and uniqueness of weak solutions for an initial boundary problem of a fourth-order
parabolic equation with variable exponent of nonlinearity. First, the authors of this paper apply Leray-Schauder’s fixed point
theorem to prove the existence of solutions of the corresponding nonlinear elliptic problem and then obtain the existence
of weak solutions of nonlinear parabolic problem by combining the results of the elliptic problem with Rothe’s method. In
addition, the authors also discuss the regularity of weak solutions in the case of space dimension one. 相似文献
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奇性边值问题的正解存在性 总被引:10,自引:0,他引:10
本文考虑具有奇性的两点边值问题,主要依据锥映射理论中的一个不动点定理,构造了一系列解的存在性条件,并在最后又证明了单减条件下奇性边值问题解的存在性的一个简明定理. 相似文献
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On the existence of periodic solutions for large-scale systems 总被引:1,自引:0,他引:1
In recent ten years or more, many scholars have engaged in the investigation concerning the stability of large-scale systems, but up to the present, the problem on the existence of periodic solutions for large-scale systems has yet been seldomly touched upon in the literature.In this paper, by means of the method of constructing Lyapunov function. We study the problem on the existence of periodic solutions for linear and nonlinear large-scale systems, and obtain several sufficient conditions which guarantee the existence of periodic solutions. 相似文献
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Using a fixed point theorem in cones, the paper consider the existence of positive solutions for a class of second-order m-point boundary value problem. Sufficient conditions to ensure the existence of double positive solutions are obtained. The associated Green function of this problem is also given. 相似文献
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本文讨论非线性方程的非局部初值问题,利用半群理论、单调算子理论以及Banach不动点定理,分别得到两个问题的温和解和弱解的存在唯一性定理. 相似文献
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本文主要考虑如下Kirchhoff问题{-(a+b∫R_3|?u|~2dx)?u+u=f(x,u)+Q(x)|u|~4u,u∈H~1(R~3),其中a,b是正的常数.我们证明了基态解,即上述问题的极小能量解的存在性.同时,如果假定Q≡1,且h(x)满足一定的条件,可以证明下述问题{-(a+b∫R_3|?u|~2dx)?u+u=|u|~4u+h(x)u,u∈H~1(R~3)的基态解的存在性. 相似文献