数量对合矩阵的线性组合的秩的不变性

若矩阵A、B满足A2=λ2I、B2=μ2I（λμ≠0）,称A、B都是数量对合矩阵．当非零复数a、b、u、v满足μλ＋bμ≠0、uλ＋vμ≠0时,我们证明了数量对合矩阵A、B与单位矩阵,的线性组合的秩总是相等,并且是一个与a、b、札、u选择都无关的常数．应用所得到数量对合矩阵的线性组合的秩的不变性,可推广已有文献的关于对合矩阵的相应结果．     

无限广义块Toeplitz和Hankel矩阵求逆的统一方法

利用Sylvester位移方程的统一办法给出所谓的无限广义块Toeplitz和Hankel矩阵的求逆公式。     

无限广义块Toeplitz和Hankel矩阵求逆的统一方法

利用 Sylvester位移方程的统一办法给出所谓的无限广义块Toeplitz和 Hankel矩阵的求逆公式 .     

广义矩阵函数及其指标

本文推广了广义矩阵函数及对称张量的一些定理，给出了广义矩阵函数指标的若干关系式．     

广义块对角占优矩阵的判定

1、引言 各类对角占优矩阵是数值代数和矩阵分析研究中的重要课题之一．对于线性方程组AX=6,当系数矩阵A为（块）对角占优矩阵或广义（块）对角占优矩阵时,许多经典的迭代算法均是收敛的,同时对目前提出的一些修正算法也是收敛的．因此,判断一个矩阵是否是广义（块）对角占优矩阵具有重要意义．国内外许多学者都做了不少研究（见文[1．5]）,本文给出了几个广义对角占优矩阵的判别方法．     

行块矩阵M-P逆的充要条件

通过使用矩阵秩方法,证明了如下结果:[A,B]+=[αA+βB+]βAA*αBB*.[A,B][A,B]+=αAA++βBB+R(A)=R(B).这里,α+β=1,α>0,β>0.这两个结果是2007年田永革在国际线性代数学会会刊中获得的相应结果的推广.     

增次广义Vandermonde矩阵

定义了增次广义Vandermonde矩阵,并利用反证法或行列式推得它们的秩和某些逆.     

关于矩阵秩(不)等式的分块矩阵构造证明

利用构造分块矩阵并通过广义初等变换的方法,证明矩阵秩的（不）等式．     

块H-矩阵与块矩阵的谱

利用G-函数概念研究块H-矩阵,引入若干块矩阵概念。获得了块H-矩阵的等价刻划,得到了一般块矩阵特征值的由G-函数描述的分布域,由于用G-函数刻划,所获结果具有一般性。     

On Rank Invariance of Schwarz-Pick-Potapov Block Matrices of Matricial Schur Functions

We derive statements on rank invariance of Schwarz-Pick-Potapov block matrices of matrix-valued Schur functions. The rank of these block matrices coincides with the rank of some block matrices built from the corresponding section matrices of Taylor coefficients. These results are applied to the discussion of a matrix version of the classical Schur-Nevanlinna algorithm.     

Stieltjes函数生成的广义Loewner矩阵的秩不变性

研究由Stieltjes函数生成的两类广义Loewner矩阵的秩不变性,证明了由同一Stieltjes函数生成的第一类同型的广义Loewner矩阵的秩是相等的,而生成的第二类同型的广义Loewner矩阵的秩相等或者相差1.     

On Negative Inertia of Pick Matrices Associated with Generalized Schur Functions

It is known [6] that for every function f in the generalized Schur class and every nonempty open subset Ω of the unit disk , there exist points z₁,...,z_n ∈Ω such that the n × nPick matrix has κ negative eigenvalues. In this paper we discuss existence of an integer n₀ such that any Pick matrix based on z₁,...,z_n ∈Ω with n ≥ n₀ has κ negative eigenvalues. Definitely, the answer depends on Ω. We prove that if , then such a number n₀ does not exist unless f is a ratio of two finite Blaschke products; in the latter case the minimal value of n₀ can be found. We show also that if the closure of Ω is contained in then such a number n₀ exists for every function f in .     

分块r-循环Toeplitz矩阵的特征值方程

给出了分块 r-循环 Toeplitz矩阵特征方程的一个求法 ,推广了文 [1 ]的结果 .     

分块矩阵g-逆的块独立性

本文研究分块矩阵g-逆的块独立性,得到两个和三个复矩阵块独立的充分 必要条件,并揭示了不同定义下的块独立性定义之间的联系.     

对角因子分块循环矩阵的对角化和谱分解

导出了对角因子分块循环矩阵的概念，把循环矩阵的对角化和谱分解推广到具有对角因子循环结构的分块矩阵中去．     

On the computation of the rank of block bidiagonal Toeplitz matrices

In the present paper we study the computation of the rank of a block bidiagonal Toeplitz (BBT) sequence of matrices. We propose matrix-based, numerical and symbolical, updating and direct methods, computing the rank of BBT matrices and comparing them with classical procedures. The methods deploy the special form of the BBT sequence, significantly reducing the required flops and leading to fast and efficient algorithms. The numerical implementation of the algorithms computes the numerical rank in contrast with the symbolical implementation, which guarantees the computation of the exact rank of the matrix. The combination of numerical and symbolical operations suggests a new approach in software mathematical computations denoted as hybrid computations.     

矩阵多项式的平方根矩阵

研究了矩阵多项式的开平方问题,给出了矩阵多项式能开平方的充分必要条件及其平方根矩阵的个数,包含并推广了文[1]中的主要结论.     

Spectral and Computational Analysis of Block Toeplitz Matrices Having Nonnegative Definite Matrix-Valued Generating Functions

It is well known that the generating function f L ¹([–, ], ) of a class of Hermitian Toeplitz matrices A _n(f) _n describes very precisely the spectrum of each matrix of the class. In this paper we consider n × n Hermitian block Toeplitz matrices with m × m blocks generated by a Hermitian matrix-valued generating function f L ¹([–, ], C ^m×m ). We extend to this case some classical results by Grenander and Szegö holding when m = 1 and we generalize the Toeplitz preconditioning technique introduced in the scalar case by R. H. Chan and F. Di Benedetto, G. Fiorentino and S. Serra. Finally, concerning the spectra of the preconditioned matrices, some asymptotic distribution properties are demonstrated and, in particular, a Szegö-style theorem is proved. A few numerical experiments performed at the end of the paper confirm the correctness of the theoretical analysis.