Brauer定理与Shemesh定理的改进

本文引进了矩阵有向图的κ—path覆盖概念，借此给出一个新的特征值分布定理，改进了经典的Brauer定理；进而给出一类矩阵的秩的下界，改进了Shemes定理。     

m-增生算子的紧扰动的一些映射定理

本文在实Banach空间中证明了几个m-增生算子紧扰动的映射定理，它们分别改进了Kartsatos(1987，1993)，Morales(1991)和何震等人(1992)的结果。     

Hilbert型不等式及其应用

本文通过引入两个函数u（x）和v（x），（x∈[0，＋∞））建立了一个新的Hiblert型不等式,特别,u（m）=m＋λ及v（n）=n＋λ（∈No，λ=1/2，1）时，得到了Hilbert不等式的一个改进,作为应用，给出了Fejer-Riesz不等式的推广和改进．     

积分中值定理的改进

本改进了(第一)积分中值定理的结论，证明了定理中的中间值ζ属于开区间(α，b)．在将定理条件适当加强后，(第一)积分中值定理可由微分中值定理证得，揭示了它们之间的内在联系。     

基于改进的两类积分中值定理的一题多解

综述了第一和第二积分中值定理的中值点在区间内部取得的改进定理,得到了一个简单的改进的积分第二中值定理.利用改进的第一和第二积分中值定理,对文献[1]中的一个典型题目给出了一题多解.     

对一道数学竞赛命题的改进

北京市第4届大学生数学竞赛试题第9题，可以删去冗余条件而得到改进。     

半线性方程周期边值问题

本文利用整体反函数理论，研究了半线性周期边值问题，给出存在唯一性的充分条件，推广和改进了现有的结果。     

自乘零化灰阵有关定理及证明的改进

本文对文[1]中有关自乘零化灰阵的定理及其证明给出了改进，并得出了传递矩阵的计算方法。     

G-凸空间中的KKM定理，匹配定理和截口定理

在G-凸空间中证明了一些新的KKM型定理．作为应用,在G-凸空间中得到了一些新的匹配定理和截口定理,所得结果改进和推广了[2,3,7]中的相关结果．     

具有两个公共值集的亚纯函数的唯一性

讨论了亚纯函数具有两个公共值集的唯一性问题，改进仪洪勋的结果。     

Necessary and sufficient conditions for a matrix to be causative in a nonstationary Markov chain

Given a sequence of transition matrices for a nonstationary Markov chain, a matrix whose product on the right of a transition matrix yields the next transition matrix is called a causative matrix. A causative matrix is strongly causative if successive products continue to yield stochastic matrices. This paper presents necessary and sufficient conditions for a matrix to be causative and strongly causative with respect to an invertible transition matrix, by considering the causative matrix as a linear transformation on the rows of the transition matrix.     

广义循环矩阵的一个性质

可表为非奇异对角矩阵和循环矩阵乘积的矩阵,我们称其为广义循环矩阵.本文给出了单位矩阵与广义循环矩阵的和矩阵的非奇异的充要条件,得到了这样和矩阵的相对增益阵列的显示表达式.     

关于正定矩阵的子式阵的正定性

研究正定矩阵的子矩阵,利用合同标准形分别给出了复正定矩阵的子式阵为复正定矩阵和实正定矩阵的子式阵为实正定矩阵的充分必要条件,其结果简单而实用.     

Partitioning of invariant imbedding systems

The choice of partitioning the system matrix for a system of N linear ordinary differential equations may determine the ease or difficulty of obtaining a solution by the invariant imbedding method of Scott. This paper shows how the configuration and partitioning of the system matrix is reflected in the fundamental matrix. The partitioning of the fundamental matrix is the key to the ease or difficulty of obtaining a solution. If the fundamental matrix is known for a given system matrix configuration and partitioning, then the fundamental matrix associated with a new system matrix configuration may be derived by the same row and column interchanges that transformed the old system matrix into the new system matrix. The fundamental matrix for the new system matrix does not have to be recalculated anew from the Kronecker delta initial conditions.     

矩阵的正规化

本文考虑ｎ阶复矩阵可嵌入到ｎ＋１阶的正规矩阵的条件．证明了ｎ＞２阶的复矩阵不一定可嵌入到ｎ＋１阶的正规矩阵,而２阶复矩阵总可嵌入到３阶正规矩阵中．本文还证明了任意ｎ阶复方阵可嵌入到２ｎ阶正规矩阵中     

加速修改AHP中的判断矩阵的贪婪算法

通过分析判断矩阵 ,一致性矩阵 ,导出矩阵及度量矩阵的关系 ,提出一种修改判断矩阵的预测加速修正的贪婪算法 .贪婪法不追求最优解 ,不要回溯 ,只希望得到较为满意的解 .当判断矩阵的一致性较差时 ,基于度量矩阵中偏离大的元素对判断矩阵一致性的影响较大 ,通过导出矩阵和度量矩阵得出加速修正的步长 .每次只修改判断矩阵的一对元素 .实例分析表明 ,修改 AHP中的判断矩阵的贪婪算法是可行的 .     

An internal characterisation of structural matrix rings

It is known that structural matrix rings pro-vide a natural passage from complete matrix rings to upper and lower triangular matrix rings, and they often explain the peculiarities regarding certain properties of complete matrix rings on the one hand and of triangular matrix rings on the other hand. In this paper the concept of a set of matrix units in a ring associated with a quasi-order relation is introduced and used to provide an internal char-acterisation of structural matrix rings.     

Matrix Christoffel Functions

We introduce and study matrix Christoffel functions for a matrix weight W. We find an explicit expression of the matrix Christoffel functions in terms of any sequence of orthonormal matrix polynomials with respect to W. An extremal property related to the matrix moment problem defined by W is established for the matrix Christoffel functions. We finally find the relative asymptotic behavior of the matrix Christoffel functions associated to matrix weights in the matrix Nevai class.     

基于部分基变量的LP问题矩阵算法

基于部分基变量提出了LP问题的矩阵算法. 该算法以最优基矩阵的一个充分必要条件为基础,首先将一个初始矩阵转化为右端项和检验数均满足要求的矩阵,再转为检验数满足要求的基矩阵,最后转化为最优基矩阵.该算法具有使用范围广、计算规模小、计算过程简化、计算机易于实现的优势.矩阵算法的核心运算是求逆矩阵的运算,提出了矩阵算法的求逆问题,讨论并给出了求逆快速算法,该算法充分利用了矩阵算法迭代过程中提供的原来的逆矩阵的信息经过简单的变换得到新的逆矩阵,该算法比直接求逆法计算效率更高.     

ON HERMITE MATRIX POLYNOMIALS AND HERMITE MATRIX FUNCTIONS

In this paper properties of Hermite matrix polynomials and Hermite matrix functions are studied. The concept ot total set with respect to a matrix functional is introduced and the total property of the Hermite matrix polynomials is proved. Asymptotic behaviour of Hermite matrix polynomials is studied and the relationship of Hermite matrix functions with certain matrix differential equations is developed. A new expression of the matrix exponential for a wide class of matrices in terms of Hermite matrix polynomials is proposed.