关于Quantale矩阵M-P广义逆的注记

主要指出文[1]关于M-P广义逆若干定理成立遗漏的条件,并在文[1]的基础上对M-P广义逆进行深入研究,得到关于Quantale矩阵M-P广义逆的一些新结论.     

EP矩阵的Hartwig-Spindelbck 问题与ρ·M-P 逆的倒换顺序律

本文证明了体上矩阵的ρ·M-P 逆的倒换顺序律的十种刻划,给出了四元数矩阵 M-P 逆的倒换顺序律的一种新刻划,并在四元数体上解决了文献[1]中关于 EP 矩阵的两个未解问题.     

EP矩阵的Hartwig-Spindelbck 问题与ρ·M-P 逆的倒换顺序律

本文证明了体上矩阵的ρ·M-P 逆的倒换顺序律的十种刻划,给出了四元数矩阵 M-P 逆的倒换顺序律的一种新刻划,并在四元数体上解决了文献[1]中关于 EP 矩阵的两个未解问题.     

广义逆A_(T,S)~(2)的一种计算方法

本文给出了利用特征多项式求矩阵广义逆AT,S(2)的一种计算方法,并由此得到了加权M-P逆AM,N+、M-P逆A+、Drazin逆Ad及群逆A9的相应计算方法,推广了文献[2]的结果.     

Quantale矩阵的广义逆及其正定性

给出Quantale矩阵{1}-广义逆的一种刻划以及存在的条件,给出Quantale矩阵M-P广义逆的定义,讨论Quantale矩阵M-P广义逆的若干性质,得到Quantale矩阵M-P广义逆的具体形式.引入Quantale矩阵正定性的概念,研究交换幂等Quantale上矩阵正定的一些性质,得到交换幂等Quantale上矩阵正定的一些等价刻画.     

非交换主理想整环上三矩阵乘积的Moore-Penrose逆的倒换顺序律

本文研究非交换主理想整环R上三矩阵乘积M-P逆的倒序律成立的刻划问题文中阐述R上矩阵的秩的定义,并利用R上矩阵与 R所嵌入的商除环K上矩阵的秩之间的关系,把文[2]中复矩阵的主要结果直至推广到R上,得到了倒序律成立的若干个刻划.     

关于态射的广义逆

本文得到了范畴中态射M-P逆存在的一些新的充要条件,又将复矩阵广义道乘积公式成立的条件推广到加法范畴中,还研究了具有核及上核的M-P逆和群逆存在的条件及有关表达式。     

一类2-Hessenberg矩阵的广义逆

在[2]中,Ikebe给出了一类下Hessenberg矩阵之逆的上三角部分的求法,从而导出三对角矩阵求逆的一种方法.文[4]中获得了计算该类Hessenberg矩阵的逆和广义逆的显式公式,由此也可得出计算三对角矩阵广义逆的方法,文[3]将[2]中的结果推广到更一般的k-Hessenberg矩阵,进而得到带状矩阵求逆的一种方法.本文研究一类实2-Hessenberg矩阵的广义逆,表明这些广义逆可由低阶三角矩阵的逆和几个简单的秩-1或     

矩阵之和的加权Moore—Penrose逆

§1.引言 Cline在[2]中讨论了矩阵UU~* VV~*的广义逆,并当UV~*=0(或U~*V=0)时给出了矩阵之和U V的广义逆的表达式。本文讨论矩阵UW_1U~* VW_2V~* VT~*U~* UTV~*的加权广义逆,其中[_(T~*W_2)~(W_1T)]是正定矩阵。并当UN~(-1)V~*=0(或U~*MV=0)时给出了矩阵之和U V的加权广义逆的表示。作为特例,给出了不同于[2]的UU~* VV~*及U V的广义逆的表达式。     

L(V)是无限维中心代数的初等证明

研究域F上无限维线性空间V的任一子空间W的线性变换在V上的扩张,用初等方法可证明V的线性变换代数L(V)是无限维的中心代数.在一定意义上推广了域F上的n级矩阵代数是中心代数这一结果.     

结构动力学逆特征值问题的同伦解法

将结构动力学反问题视为拟乘法逆特征值问题,利用求解非线性方程组的同伦方法来解决结构动力学逆特征值问题,这种方法由于沿同伦路径求解,对初值的选取没有本质的要求,算例说明了这种方法是可行的．     

用3个向量对构造梁振动系统的刚度矩阵

针对梁的离散化模型的刚度矩阵是五对角矩阵,梁振动反问题的实质是实对称五对角矩阵的特征值反问题.该文利用向量对、Moore-Penrose广义逆给出了实对称五对角矩阵向量对反问题存在唯一解的条件,并结合矩阵分块讨论了双对称五对角矩阵向量对反问题解存在唯一的条件,进而计算了次对角线位置元素为负,其它位置元素均为正的实对称五对角矩阵特征值反问题.由于构造梁的离散模型需要的数据可由测试得到,故而其结果适合于模态分析、系统结构的分析与设计等方面应用.最后给出了数值算例,通过数值讨论说明方法的有效性.     

一类渗透率反演问题解的存在性与唯一性

本根据Thierry Bourbie et al建立的测定致密岩心的渗透率的装置，交换相应的数学模型中的边界条件和附加条件位置，得到了相应正问题的解析解．尔后，运用偏微分方程反问题中的系数反演方法，构造出了反演渗透率的关系式，在此基础上，运用不动点定理讨论了解析反演解的存在性与唯一性．反演的结果表明：只要在L端持续测量t1时间间隔，则所给的附加条件可以唯一确定渗透率．     

DAS WALLMAN-VERFAHREN UND INVERSE LIMITES

Abstract

The relationship between Wallman's construction of a compact T₁-space [9] and Flachsmeyer's inverse limit spaces of inverse systems of decomposition spaces [2] is investigated. There are connections between Wallman spaces and inverse limits, which were initiated by Alexandroff in 1928. Some old theorems using inverse limits have shorter proofs now. On the other hand we obtain a new method to treat Wallman compactifications in terms of inverse limit spaces. A suitable notion in this context is the “prime-filter space”, having an interesting maximality property. This space seems to be proper to examine prime ideals in C(X).     

具有某种断面的半群的研究进展

本文综述了几类具有特殊断面的半群的近期研究结果。在介绍逆半群和正则半群的一般结构之后，概述了具有逆断面的正则半群的结构和同余格的研究成果。总结了作为逆断面的推广的可裂断面，纯正断面，正则^*－断面和恰当断面。提出了可以进一步研究的重要的问题。     

Two sample Bayesian prediction intervals for order statistics based on the inverse exponential-type distributions using right censored sample

In this paper, two sample Bayesian prediction intervals for order statistics (OS) are obtained. This prediction is based on a certain class of the inverse exponential-type distributions using a right censored sample. A general class of prior density functions is used and the predictive cumulative function is obtained in the two samples case. The class of the inverse exponential-type distributions includes several important distributions such the inverse Weibull distribution, the inverse Burr distribution, the loglogistic distribution, the inverse Pareto distribution and the inverse paralogistic distribution. Special cases of the inverse Weibull model such as the inverse exponential model and the inverse Rayleigh model are considered.     

Normal forms for semigroup amalgams

We define a class of inverse semigroup amalgams and derive normal forms for the amalgamated free products in the variety of semigroups. The class includes all amalgams of finite inverse semigroups, recently studied by Cherubini, Jajcayova, Meakin, Nuccio, Piochi and Rodaro (2005–2014), and lower bounded amalgams, that were introduced by the author (1997). We provide sufficient conditions for decidable word problem. We show that the word problem is decidable for an amalgamated free product of finite inverse semigroups. The normal forms can be used to study amalgams in subvarieties of inverse semigroups. In a forthcoming paper by the author, the results are used for varieties of semilattices of groups.     

关于带W权Drazin逆的表示定理及迭代方法

To study singular linear system, Cline and Greville[8] proposed the concept of W-weighted Drazin inverse for the rectangular matrices,where the properties were also discussed. The computation for the W-weighted Drazin inverse is of much interest, which is mainly divided into two kinds of methods: direct method[2,4,6] and iterative method[3,5,7,9,12,13]. In this paper, we study the iterative method and successive matrix squaring(SMS) method for the W-weighted Drazin inverse and generalize the main results in [12,13].     

Weighted weak group inverse for Hilbert space operators

We present the weighted weak group inverse, which is a new generalized inverse of operators between two Hilbert spaces, and we extend the notation of the weighted weak group inverse for rectangular matrices. Some characterizations and representations of the weighted weak group inverse are investigated. We also apply these results to define and study the weak group inverse for a Hilbert space operator. Using the weak group inverse, we define and characterize various binary relations.