Hilbert不等式的加强及其应用

通过引入一个形如(x)/1+(x)(x≥0)的函数,建立一种新的加权Hilbert不等式.并且给出权函数的具体表达式.从而得到经典Hilbert重级数定理的一个加强结果;作为它的应用,给出Hardy-Littlewood不等式和Widder不等式的一些改进.     

关于 Hilbert积分不等式(英)

本文通过引入一个适当的形如F（x，y）的正定二次型证明了Hilbert积分不等式可以得到改进．利用这一结果，Widder不等式得到了加强，并且建立了广义的Hardy－Littlewood不等式．     

一类 q=1的鞅 Φ-不等式

对于 q>1的鞅Φ-不等式,到目前为止已经作了较充分的研究.但是,对于q=1的鞅Φ-不等式,至今尚未见其研究成果.本文就一类满足一定条件的q=1的 Young 函数Φ,给出了与 q>1相类似的鞅Φ-不等式.从而把有关的结果推广到这一类 q=1的 Young 函数上去.     

关于一个改进的Hardy-Hilbert不等式

通过建立权系数并利用改进了的Hlder不等式,得到了一个新的改进的Hardy-Hilbert不等式.当p=2时,便得到了经典的Hilbert不等式的一个改进.     

关于Hardy-Hilbert不等式的一种新改进

研究了带参数的Hardy-Hilbert型不等式,利用加强的H(o)lder's不等式对Hardy-Hilbert不等式作了改进,建立了一些新的不等式.     

两个凸函数单调平均不等式的改进

改进了有关凹函数和凸函数的算术平均值单调性的某些已知结论.作为应用,加强了M inc-Sathre不等式和A lzer不等式.     

关于正定矩阵的两个不等式

通过Hermite矩阵的谱分解及一个改进的Young不等式,得到了关于正定矩阵的两个不等式,所得结果是对一些经典的矩阵不等式的进一步推广.最后,作为应用,给出了著名的Holder不等式和Minkowsi不等式的一种反向形式.     

Hardy-Hilbert积分不等式的改进

通过引入带参数的指数积分并利用Bernoulli不等式以及改进了的Hlder不等式,对Hardy-Hilbert积分不等式作了有意义改进.特别,当p=2时,得到了经典的Hilbert积分不等式的一个很强的结果.     

Hardy-Hilbert型积分不等式的一种新改进

研究了带积分核函数和参数λ（λ〉1）的Hardy-Hilbert型不等式,并利用加强的Hlder’s不等式对Hardy-Hilbert不等式作了改进,建立了一些新的不等式.     

关于反余弦函数的Shafer-Fink型不等式

改进了Carlson不等式,得到了关于反余弦函数的Shafer-Fink型不等式.     

Widder’s Representation Theorem for Symmetric Local Dirichlet Spaces

In classical PDE theory, Widder’s theorem gives a representation for non-negative solutions of the heat equation on \(\mathbb{R }^n\) . We show that an analogous theorem holds for local weak solutions of the canonical “heat equation” on a symmetric local Dirichlet space satisfying a local parabolic Harnack inequality.     

The story of majorizability as Karamata’s condition of convergence for Abel summable series

The greatest Serbian mathematician, Jovan Karamata (1902–1967), gained worldwide fame working on problems related to theorems of a Tauberian nature. His simple and elegant 1930 proof of the Hardy–Littlewood theorem found its place in the well-known monographs by Titchmarsh, Knopp, Doetsch, Widder, Hardy and Favard. It is less known that the method used in this proof was mentioned for the first time at a conference of the Academy of Natural Sciences of the Serbian Royal Academy of Sciences in Belgrade in 1929, where Karamata introduced the notion of majorizability as a new condition of convergence for Abel summable series. This fact holds the key to a historical insight into Karamata’s famous proof of the Hardy–Littlewood theorem.     

A new convolution theorem for the Stieltjes transform and its application to a class of singular integral equations

Dedicated to the memory of Professor David Vernon Widder (1898–1990)     

Finding the point of jump and the value of jump of the original function from its Laplace transform

We propose a method for finding points and values of jumps of a given original function based on Widder’s inversion formulas.     

Geometric and approximation properties of a complex Post–Widder operator in the unit disk

The purpose of this work is to obtain Jackson-type estimates in approximation by a complex Post–Widder operator in the unit disk. In addition, these operators preserve some sufficient conditions for starlikeness and univalence of analytic functions.     

Post-Widder算子线性组合加Jacobi权的Lp同时逼近

给出了Post-Widder算子线性组合加Jacobi权的Lp同时逼近的正、逆定理和逼近阶的特征刻划．     

Hilbert–Pachpatte type general integral inequalities

In this article we present very general weighted Hilbert–Pachpatte type integral inequalities. These are regarding ordinary derivatives and fractional derivatives of Riemann–Liouiville and Canavati types. Also regarding general derivatives of Widder type and linear differential operators. Our results apply to continuous functions and some to integrable functions.     

Identities for the Hankel transform and their applications

In the present paper the authors show that iterations of the Hankel transform with Kν-transform is a constant multiple of the Widder transform. Using these iteration identities, several Parseval-Goldstein type theorems for these transforms are given. By making use of these results a number of new Goldstein type exchange identities are obtained for these and the Laplace transform. The identities proven in this paper are shown to give rise to useful corollaries for evaluating infinite integrals of special functions. Some examples are also given as illustration of the results presented here.     

The Characterization of the Derivatives for Linear Combinations of Post–Widder Operators inLp

The aim of the paper is to characterize the global rate of approximation of derivativesf^(l)through corresponding derivatives of linear combinations of Post–Widder operators in an appropriate weightedL_p-metric using a weighted Ditzian and Totik modulus of smoothness, and also to characterize derivatives of these operators in Besov spaces of Ditzian–Totik type.