时间测度链上n阶非线性中立型时滞动力方程的振动性

研究时间测度链上的一类n阶非线性中立型时滞动力方程的振动性.利用时间测度链上的有关理论和不等式技巧,获得该类方程振动的判别准则,这些准则不仅是新的,而且在时间测度链上统一了高阶非线性中立型时滞微分方程和差分方程的振动性质,最后举例说明了本文主要结果的应用.     

时间测度链上具正负系数的二阶阻尼动力方程的振动准则

研究了时间测度链上一类具正负系数和阻尼项及非线性中立项的二阶变时滞非线性动力方程的振荡性.利用时间测度链上的有关理论及广义Riccati变换,结合大量不等式技巧,建立了该方程若干新的振动准则,这些准则不仅推广和改进了一些已知的结果,而且在时间测度链上统一了二阶非线性时滞阻尼微分方程和二阶非线性时滞阻尼差分方程的振动性质.     

时间测度链上带有时滞的中立型动力方程的伪概周期解[英文]

本文研究时间测度链上伪概周期函数的性质.利用时间测度链上指数型二分性性质以及Banach不动点定理,我们得到时间测度链上带有时滞的中立型动力方程的伪概周期解存在性与唯一性的充分条件.并举例说明我们的结论     

带权散度型椭圆算子的低阶特征值估计

本文首先给出紧致带边(边界可以为空集)光滑度量测度空间上带权散度型算子的低阶特征值的一个一般不等式,通过使用这个一般不等式,可以得到光滑度量测度空间中有界连通区域上带权散度型算子的低阶特征值的一些万有不等式.     

Finsler度量测度空间上的容量

本文在Finsler度量测度空间上推广容量(capacity)理论,并研究对应的Sobolev空间.特别地,通过容量,本文给出Finsler度量测度空间上零边值Sobolev空间的完整刻画,并由此建立闭Finsler度量测度空间上的一个最优Hardy型不等式.     

时间测度链上一类二阶Emden-Fowler型动态方程的振荡性

研究了时间测度链上的一类具有阻尼项的二阶非线性中立型变时滞Emden-Fowler型泛函动态方程的振荡性,利用时间测度链上的微积分理论和广义的Riccati变换及不等式技巧,建立了该方程的几个新的振荡准则,这些准则不仅推广和改进了一些已知的结果,而且在时间测度链上统一了二阶Emden-Fowler型阻尼微分方程和差分方程的振荡性质.并给出了具体实例来说明本文的主要结论.     

跳过程μ正则性和不变测度存在性

本文给出了一般状态跳过程μ正则的充分条件,作为其推论得到跳跃链常返的跳过程是μ正则的,证明了跳跃链常返的跳过程,其q对的不变测度是跳过程的不变测度.还证明了跳跃链常返的跳过程存在唯一的不变测度.     

时间测度链上一类二阶动力方程的振动性

研究了时间测度链上的一类具有非线性中立项和变时滞的二阶非线性动力方程的振动性.通过引入参数函数和广义的Riccati变换,并借助时间测度链上的有关理论,得到了方程振动的几个充分条件.所得结果推广和改进了现有文献中相应的结果.     

测度链上具有变号非线性项微分方程的正解(英文)

本文研究了测度链上具有变号非线性项微分方程的问题.利用拓扑方法,获得了此微分方程的正解存在性结果,推广和改进了一些文献中相应的结果.     

具阻尼项的一类二阶非线性动态方程的振动准则（英文）

本文研究时间测度链上的一类具阻尼项和非线性中立项的二阶非线性变时滞泛函动态方程[A(t)(yΔ(t))]Δ+b(t)(yΔ(t))+P(t)F((x(δ(t))))-Q(t)f((x(γ(t))))=0,的振动性质,式中T为任一时间测度链且supT=+∞,y(t)=x(t)+B(t)g(x(τ(t))),(u)=|u|λ-1 u,λ0.利用时间测度链上的理论和广义Riccati变换及不等式技巧,建立该方程的若干新的振动准则,这些准则不仅补充和改进了现有文献中的相关结论,而且改进了具有阻尼项和中立项的二阶动态方程的一些已知振动理论,更进一步,本文的主要结果还改良了相应的二阶时滞微分方程和差分方程的振动准则.并给出一些例子来说明研究结果的重要性.     

一类混合型周期系统的周期解及其能控性

本文首先利用 Fourier分析的有关结论和 Cauchy不等式 ,对一类具有滞后与超前偏差变元的 n阶常系数混合型线性周期系统周期解存在唯一性的充要条件进行了讨论 .本文所得到的结果不但是对前人工作的改进 ,而且是对前人工作所存在的问题的一个修正 .然后 ,对所论系统提出一个控制问题并证明了系统的可控性 .     

Some Remarks on the Stability of the Log-Sobolev Inequality for the Gaussian Measure

This note consists of two parts. Firstly, we bound the deficit in the logarithmic Sobolev Inequality and in the Talagrand transport-entropy Inequality for the Gaussian measure, in any dimension, by means of a distance introduced by Bucur and Fragalà. Thereafter, we investigate the stability issue with tools from Fourier analysis.     

Multi-linear measure theory and multiple stochastic integration

Summary Stochastic integration in a Lebesgue Stieltjes sense is developed in a general context of multi-linear measure theory based on the Fundamental Grothendieck Inequality and Factorization Theorem.Research partially supported by NSF Grant DMS 8601485     

两个反三角平均的Schur凸性及不等式链

关于张帆,钱伟茂所定义的四个反三角函数平均,利用Hermite-Hadamard不等式证得其中两个反三角平均:Marcsin(a,b)分别是Schur-凸,Schur-几何凸,Schur-调和凸;Marctan(a,b)分别是Schur-凹,Schur-几何凸,Schur-调和凸,并结合凸函数理论得出若干不等式链.     

\mathbb{R}�϶Գ�Cauchy�����񼯵�ȷ��Hausdorff���

??This paper establishes limsup type law of the iterated logarithm of the occupation measure, using the asymptotic equivalence relation between the occupation measure and the number of excursion process of a symmetric Cauchy process. Furthermore, by using the density theorem and the economic coverage method, it derives the exact Hausdorff measure for the range of a symmetric Cauchy process in \mathbb{R}.     

On Operator-Valued Semicircular Random Variables

In this paper, we discuss some special properties of operator-valued semicircular random variables including representation of the Cauchy transform of a compactly supported probability measure in terms of their operator-valued Cauchy transforms and existence of nonzero discrete part of their associated distributions.     

Functional Integrals for the Schrodinger Equation on Compact Riemannian Manifolds

In this paper, we represent the solution of the Cauchy problem for the Schrodinger equation on compact Riemannian manifolds in terms of functional integrals with respect to the Wiener measure corresponding to the Brownian motion in a manifold and with respect to the Smolyanov surface measures constructed from the Wiener measure on trajectories in the underlying space. The representation of the solution is obtained for the case of analytic (on some sets) potential and analytic initial condition under certain assumptions on the geometric characteristics of the manifold. In the proof, we use a method due to Doss and the representations via functional integrals of the solution to the Cauchy problem for the heat equation in a compact Riemannian manifold.     

On the structure of stable random walks

We show that the Cauchy random walk on the line, and the Gaussian random walk on the plane are similar as infinite measure preserving transformations.     

On the BKT inequality and improved bounds for perfect systems of difference sets

We present a generalization of the BKT Inequality, an inequality for perfect systems of difference sets due to Bermond, Kotzig, and Turgeon, and deduce from this generalization bounds for perfect systems which in some cases improve on those provided by the BKT Inequality. We discuss, in particular, the so-called critical case in which the BKT Inequality holds with equality.     

Convergent Interpolation to Cauchy Integrals over Analytic Arcs

We consider multipoint Padé approximation to Cauchy transforms of complex measures. We show that if the support of a measure is an analytic Jordan arc and if the measure itself is absolutely continuous with respect to the equilibrium distribution of that arc with Dini-smooth nonvanishing density, then the diagonal multipoint Padé approximants associated with appropriate interpolation schemes converge locally uniformly to the approximated Cauchy transform in the complement of the arc. This asymptotic behavior of Padé approximants is deduced from the analysis of underlying non-Hermitian orthogonal polynomials, for which we use classical properties of Hankel and Toeplitz operators on smooth curves. A construction of the appropriate interpolation schemes is explicit granted the parametrization of the arc.