高校应用数学学报第17卷(2002年)B辑(英文版)第3期目次和提要

正负系数中立型差分方程的正解的存在性罗治国　申建华 (湖南师范大学数学系 )给出了具正负系数中立型差分方程存在正解的两个充分条件 ,改进了一些相关结果 .正负系数的扰动的中立型微分方程的稳定性叶海平　高国柱 (东华大学应用数学系 )考虑具有正负系数的扰动的中立型微分方程ddt[x( t) -C( t) x( t-r) ]+ P( t) x( t-τ) -Q( t) x( t-σ) =f ( t,x( t) ) ,　 t≥ t0 .得到了这个方程的零解是一致稳定、渐近稳定的充分条件 .线性时滞系统 Liapunov泛函的存在性张胜祥 (华南农业大学理学院 )　郑祖庥 (安徽大学数学系 )考虑时滞系统x…     

函数方程在非阿基米德空间中的稳定性

利用直接的方法讨论了混合三四次方程和2~p齐性方程在非阿基米德空间中的Ulam稳定性,并证明了其稳定性定理.     

上三角Toeplitz矩阵在线性差分方程中的应用

利用上三角Toeplitz矩阵给出了常系数线性差分方程特解的表达式,对于解常系数线性差分方程带来了方便.     

几类离散动力系统的渐近行为

对于高阶线性差分方程稳定和渐近稳定最新的Хусаинов和Никифорова(1999)定理给出了新的完整、严谨、简洁的证明, 并推广到允许系数变号的线性系统和两类非线性离散动力系统. 用推广的结果来分析高阶区间线性差分方程的鲁棒稳定性及鲁棒稳定度, 且应用到离散控制系统的镇定问题的分析.     

一类线性微分代数系统的稳定性

本文讨论了一类线性时变微分代数系统的稳定性.利用Rosenbrock系统受限等价性理论,直接由方程系数给出了一些稳定性的充分条件.     

退化抛物-双曲方程动力学解的唯一性

主要研究系数显含有时间和空间变量的退化抛物-双曲型方程柯西问题动力学解的唯一性.首先推广了这种类型方程的动力学公式,在给定系数适当的光滑性条件下,得到了动力学解的唯一性.     

二阶变系数线性微分方程求解问题的新探索

二阶常系数线性微分方程的求解理论,目前已经比较完善.然而对于二阶变系数线性微分方程,其求解问题的研究仍处于发展状态中.本文在文献[3-5]的基础上,利用降阶法、线性变换法及Raccati方程的等价性得到若干个可写出通解的二阶变系数线性微分方程的新类型,尤其关于可转化为f″+gf=0二阶线性微分方程有了一些结果.     

大系统渐近稳定的一般判别定理

利用分解集结和向量 V 函数判别大系统的稳定性是一个广泛采用的有效方法.但过去一般限于集结成常系数线性比较方程,判定的只是指数稳定.本文提出一个非线性比较方程的构造定理,推广了 Bailey 方法,并且进一步推广了作者的前期工作,判定了大系统的非指数稳定.     

源自人口动力学的半线性p-Laplace的Dirichlet问题解

研究源自人口动力学的半线性p-Laplace方程的Dirichlet问题,得到了该问题在零点处的能量泛函是平凡的Morse临界群.因而,确定了该问题非平凡解的存在性及其分岔性.     

数学年刊第26卷B辑第3期(2005)目次和提要

局部分布反馈下半线性波动方程的指数镇定贾超华冯德兴文中利用黎曼几何乘子方法考虑了一个带局部阻尼的变系数半线性波动解的指数衰减问题,得到一个使系统指数稳定的几何条件.     

Hyers–Ulam stability of a system of first order linear differential equations with constant coefficients

In this paper, using matrix method, we prove the Hyers–Ulam stability of a system of first order linear differential equations with constant coefficients.     

Laplace Transform Method for the Ulam Stability of Linear Fractional Differential Equations with Constant Coefficients

Using the Laplace transform method, this paper deals with the Ulam stability of linear fractional differential equations with constant coefficients.     

Asymptotic behavior of alternative Jensen and Jensen type functional equations

In 1941 D.H. Hyers solved the well-known Ulam stability problem for linear mappings. In 1951 D.G. Bourgin was the second author to treat the Ulam problem for additive mappings. In 1982-2005 we established the Hyers-Ulam stability for the Ulam problem of linear and nonlinear mappings. In 1998 S.-M. Jung and in 2002-2005 the authors of this paper investigated the Hyers-Ulam stability of additive and quadratic mappings on restricted domains. In this paper we improve our bounds and thus our results obtained, in 2003 for Jensen type mappings and establish new theorems about the Ulam stability of additive mappings of the second form on restricted domains. Besides we introduce alternative Jensen type functional equations and investigate pertinent stability results for these alternative equations. Finally, we apply our recent research results to the asymptotic behavior of functional equations of these alternative types. These stability results can be applied in stochastic analysis, financial and actuarial mathematics, as well as in psychology and sociology.     

On the Ulam stability of mixed type mappings on restricted domains

In 1941 D.H. Hyers solved the well-known Ulam stability problem for linear mappings. In 1951 D.G. Bourgin was the second author to treat the Ulam problem for additive mappings. In 1982-1998 we established the Hyers-Ulam stability for the Ulam problem of linear and nonlinear mappings. In 1983 F. Skof was the first author to solve the Ulam problem for additive mappings on a restricted domain. In 1998 S.M. Jung investigated the Hyers-Ulam stability of additive and quadratic mappings on restricted domains. In this paper we improve the bounds and thus the results obtained by S.M. Jung, in 1998. Besides we establish the Ulam stability of mixed type mappings on restricted domains. Finally, we apply our recent results to the asymptotic behavior of functional equations of different types.     

Hyers–Ulam stability of linear partial differential equations of first order

In this work, we will prove the Hyers–Ulam stability of linear partial differential equations of first order.     

A Uniform Method to Ulam–Hyers Stability for Some Linear Fractional Equations

In this paper, we first utilize fractional calculus, the properties of classical and generalized Mittag-Leffler functions to prove the Ulam–Hyers stability of linear fractional differential equations using Laplace transform method. Meanwhile, Ulam–Hyers–Rassias stability result is obtained as a direct corollary. Finally, we apply the same techniques to discuss the Ulam’s type stability of fractional evolution equations, impulsive fractional evolutions equations and Sobolev-type fractional evolution equations.     

Ulam‐Hyers stability of Caputo fractional difference equations

We study the Ulam‐Hyers stability of linear and nonlinear nabla fractional Caputo difference equations on finite intervals. Our main tool used is a recently established generalized Gronwall inequality, which allows us to give some Ulam‐Hyers stability results of discrete fractional Caputo equations. We present two examples to illustrate our main results.     

On the Ulam stability of Jensen and Jensen type mappings on restricted domains

In 1941 Hyers solved the well-known Ulam stability problem for linear mappings. In 1951 Bourgin was the second author to treat this problem for additive mappings. In 1982-1998 Rassias established the Hyers-Ulam stability of linear and nonlinear mappings. In 1983 Skof was the first author to solve the same problem on a restricted domain. In 1998 Jung investigated the Hyers-Ulam stability of more general mappings on restricted domains. In this paper we introduce additive mappings of two forms: of “Jensen” and “Jensen type,” and achieve the Ulam stability of these mappings on restricted domains. Finally, we apply our results to the asymptotic behavior of the functional equations of these types.     

First and second order linear dynamic equations on time scales

We consider first and second order linear dynamic equations on a time scale. Such equations contain as special cases differential equations, difference equationsq— difference equations, and others. Important properties of the exponential function for a time scale are presented, and we use them to derive solutions of first and second order linear dyamic equations with constant coefficients. Wronskians are used to study equations with non—constant coefficients. We consider the reduction of order method as well as the method of variation of constants for the nonhomogeneous case. Finally, we use the exponential function to present solutions of the Euler—Cauchy dynamic equation on a time scale.     

Stability Analysis of nth Order Nonlinear Impulsive Differential Equations in Quasi–Banach Space

Abstract

This article is about Ulam’s type stability of n^th order nonlinear differential equations with fractional integrable impulses. It is a best procession to the stability of higher order fractional integrable impulsive differential equations in quasi–normed Banach space. Different Ulam’s type stability results are obtained by using the definitions of Riemann–Liouville fractional integral, Hölder’s inequality and the beta integral inequality.