Corrigendum to the paper ``Adjoining an Order Unit to a Matrix Ordered Space'

An error has been detected (and also corrected) in Theorem 2.8 of the paper entitled “Adjoining an Order Unit to a Matrix Ordered Space” (Positivity, (2005)9: 207–223; DOI ). Accordingly, some of the results of the paper have been modified. Also, a notion of C*-matricially, Riesz normed spaces has been introduced.     

一个矩阵分解算法的推广及应用

对样本相关系数矩阵等行和分解算法作了简化和推广,使算法不仅可以应用在基于正态总体非独立样本的假设检验问题,也可以有效地运用在最优化算法中牛顿法等与二次函数极小化有关的问题上.     

关于有限域F_q上矩阵阶的研究

详细地研究了有限域 Fq上的矩阵的阶的问题 ,得到了相当理想的结果 .并给出一类矩阵方幂的极小多项式的求法     

A Set-Valued Analysis Approach to Second Order Differentiation of Nonsmooth Functions

A theory of second order differentiability for real functions with calm Clarke gradient at points of strict differentiability is presented from a set-valued analysis perspective by using the theory of graphical derivatives of set-valued maps. Connections with other second order theories and applications in optimization are given. This work is partially supported by Ministerio de Educación y Ciencia (Spain), project MTM2006-02629 and IngenioMathematica (i-MATH) CSD2006-00032 (Consolider-Ingenio 2010).     

一类矢值序列空间上的矩阵变换定理

对于一类经典的矢值序列空间,文中引入一类重要子集,它包括了该序列空间的全部有界集和许多非有界集.利用Antosik-Mikusinski基本矩阵定理和该子集族,获得了一个无穷矩阵收敛定理,并且给出了一类经典无穷矩阵变换的更强刻画.此结果改进了算子级数序列赋值收敛定理.     

Schmidt Decomposition of Quaternion Matrix and the Orthonormalization of Vectors in a Generalized Unitary Space

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矩阵代数上保持与正矩阵的相似性的可加满射

用M_n表示n×n复矩阵代数(n≥2),给出M_n上双边保与正矩阵的相似性的可加满射的完全刻画和分类.     

单位圆内无限级代数体函数的Borel点

应用Ahlfors覆盖曲面的几何方法,证明了单位圆内无限级代数体函数的Borel点的存在性.将Valiron关于无限级Borel方向存在性的结果推广到了单位圆内.     

n阶矩阵的可交换空间的维数

本文通过研究矩阵的若当相似形矩阵的可交换空间 ,从而得到了矩阵的可交换空间的维数公式     

n阶仿射平面上d-disjunct矩阵的讨论

分组测试的NGT算法在许多领域有着广泛的应用,它的数学模型是d-disjunct矩阵.近年来,人们借助于复形理论、图理论、空间理论和容错估算等来研究它.介绍了分组测试和仿射平面的基本知识,在n阶仿射平面上构作了d-disjunct矩阵,证明了它的一些性质,与n阶射影平面上的d-disjunct矩阵作了比较.     

一个n有序集组的计数问题

In this paper, we discuss the counting problem of an order n-group of set (A1 ,A2 ,… ,An) which satisfies ∪^ni=1Ai={a,a2,…,am} and one of the following:(1)∩^ni=1Ai=Φ;(2)∩^ni=1Ai={b1,b2,…,bk};(3)∩^ni=1A1包含{b1,b2,…,bk};(4)Ai≠Φ(i=1,2,…,k），We solve these problems by element analytical method.     

A Complete System of Invariants with Respect to Similarity for Pairs of Matrices of Even Order with Characteristic Matrix of Special Smith form

We study the similarity of a pair of matrices of even order with special Smith form and certain conditions for the decomposability of the characteristic matrix of the pair. In this connection, we obtain a complete system of invariants for this class of pairs of matrices with respect to similarity. The results obtained are stated in the classical terms of ranks, of minimal indices, and of elementary divisors of matrices (both finite and infinite).     

四元数矩阵的广义Schmidt分解与广酉空间中向量组的广义标准正交化

推广了四元数矩阵的Schmidt分解及广酉空间中向量组的标准正交化问题，给出了实四元数矩阵分解为广酉矩阵与生对角元全正的上三角阵乘积的实用方法．     

An Elementary Example of an Order Bound Dual Space that is not Directed

This paper presents an elementary example of an order bounded linear functional on a directed partially ordered vector space that is not equal to the difference of two positive linear functionals.     

初等变换的一个应用:矩阵的满秩分解

给出利用初等变换求矩阵满秩分解的一个简洁方法.     

完全不确定Hamburger矩阵矩量问题的有限阶解

该文描述带有矩量序列{v_m}_0~∞■C~(q×q)的完全不确定Hamburger矩阵矩量问题:v_m=integral from n=-∞to∞x~m dρ(x),m=0,1,…的有限阶解,即该问题的那些解ρ,使得C~(q×q)-值多项式的线性空间P在对应的空间L~2(R,dρ/E(x))内稠密,这里E(x)为在实轴R上取正值的某个数值多项式.作为预备知识,作者考虑所谓广义Akhiezer插值的矩阵变种与它的相关矩阵矩量问题之间的一种关系.     

一类二阶常微分方程组边值问题的三个正解

在边值条件u1(0)=u′1(1)=u2(0)=u′2(1)=0下,研究并得到了二阶常微分方程组     

Characterization of the minimal and maximal operator ideals associated to the tensor norm defined by a sequence space

We characterize the minimal and maximal operator ideals associated, in the sense of Defant and Floret, to a wide class of tensor norms derived from a Banach sequence space. Our results are extensions of classical ones about tensor norms of Saphar [Studia Math. 38 (1972) 71-100] and show the key role played by the structure of finite-dimensional subspaces in this kind of problems.     

Complete orthogonal decomposition homomorphisms between matrix ordered Hilbert spaces

The purpose of this paper is to show that a complete order homomorphism and a complete orthogonal decomposition homomorphism between the non-commutative -spaces induce respectively an isomorphism and a -isomorphism between the associated reduced von Neumann algebras.

     

Counting Cocomponents of a Topological Space

Dualizing the statement about a number of components of a topological space X, we say that, for a natural number n, the space X has at most n cocomponents if every continuous map f:X ⁿ⁺¹X factorizes through X ⁿ , i.e., f depends on at most n coordinates. We construct metrizable spaces X ₁,X ₂,X ₃ such that(1) X ₁ does not have finitely many cocomponents but every continuous map X ₁ X ₁ depends only on finitely many coordinates;(2) X ₂=A×B for rigid spaces A,B and there is a continuous map X ₂ X ₂ depending on all coordinates;(3) X ₃(n) has precisely n cocomponents but it cannot be expressed as A×B with |A|>1 and |B|>1.