四元数矩阵Jordan标准的简单证明和算法

引入了友向量的概念 ,给出了四元数矩阵的秩的一种定义方法和四元数矩阵Jordan标准形的一种简单证明和算法 .     

四元数矩阵的奇异值分解及其应用

In this paper, a constructive proof of singular value decomposition of quaternion matrix is given by using the complex representation and companion vector of quaternion matrix and the computational method is described. As an application of the singular value decomposition, the CS decomposition is proved and the canonical angles on subspaces of Q^n is studied.     

四元数矩阵的Jordan标准形

本文是在四元数矩阵的重行列式理论的基础上，直接利用四元数的乘法证明了。任意一个四元数矩阵都相似于特征主值表征的Ｊｏｒｄａｎ标准形及其唯一性．     

用奇异值分解方法计算具有重特征值矩阵的特征矢量

若当(Jordan)形是矩阵在相似条件下的一个标准形,在代数理论及其工程应用中都具有十分重要的意义．针对具有重特征值的矩阵,提出了一种运用奇异值分解方法计算它的特征矢量及若当形的算法．大量数值例子的计算结果表明,该算法在求解具有重特征值的矩阵的特征矢量及若当形上效果良好,优于商用软件MATLAB和MATHEMATICA．     

用若当链构成分块矩阵计算若当标准形与相似变换矩阵

复数域上亏损矩阵的广义特征子空间的基的每个向量生成若当链,构成分块矩阵,施以初等变换,可求出若当基.获得若当标准形与相似变换矩阵的新算法.     

四元数矩阵实表示的基本性质及应用

在四元数实矩阵表示的基础上,给出了四元数矩阵的相同表示,利用友向量的概念,给出了这种实表示的性质,并进一步研究了四元数力学中的系列数值计算问题.     

求矩阵到其Jordan标准形的过渡矩阵的新算法

本文给出了一种求矩阵到其Ｊｏｒｄａｎ标准形的过渡矩阵的新算法，与其它现有的算法相比，此算法最简单有效，且最易于编制程序以利用计算机计算．     

Algebraic Method for Inequality Constrained Quaternion Least Squares Problem

In this paper, we introduce a kind of complex representation of quaternion matrices (or quaternion vectors) and quaternion matrix norms, study quaternionic least squares problem with quadratic inequality constraints (LSQI) by means of generalized singular value decomposition of quaternion matrices (GSVD), and derive a practical algorithm for finding solutions of the quaternionic LSQI problem in quaternionic quantum theory.     

矩阵与其友矩阵相似的一个充要条件及其证明

得到一个矩阵A与其特征多项式的友矩阵C相似的充要条件是对应于A的每个不同的特征值λi,Jordan标准形中只含有一个Jordan子矩阵,并给出证明.     

四元数向量和矩阵的秩

在四元数和四元数向量、矩阵空间上引入三种不同的实表示法则，将四元数列向量的左右线性相关性问题转换成实数域上向量的线性相关问题，由此获得用实矩阵的秩代替四元数矩阵列左秩和列右秩计算方法，同时得出四元数矩阵可逆的一些充要条件和一些新的四元数行列式定义．     

Factorization of matrices of quaternions

We review known factorization results for quaternion matrices. Specifically, we derive the Jordan canonical form, polar decomposition, singular value decomposition, and QR factorization. We prove that there is a Schur factorization for commuting matrices, and from this derive the spectral theorem. We do not consider algorithms, but do point to some of the numerical literature.     

On the spectral structure of monic matrix polynomials and the extension problem

We consider the following problem: find a monic matrix polynomial, given its companion matrix on a fixed invariant subspace, and given also the Jordan structure of this matrix on some complimentary invariant subspace. A detailed investigation is presented for the case when the additional Jordan matrix has only one point of spectrum.     

Abel群的一些分解定理的推广(Ⅲ)

从主理想整环上有界模分解的Prüfer-Baer定理出发,研究(无限维)向量空间的代数的线性变换的几个基本问题,得到了如下结果:设V是域F上的(无限维)向量空间,A是V上的一个代数的线性变换,则有(1)若任何与A可交换的线性变换均与线性变换B可交换,则B=f(A),其中f是F上的多项式.进而线性变换B也是代数的.(2) V中存在一组基,使A在这组基下的矩阵是有理标准型(经典标准型)矩阵.当F是代数闭域时,经典标准型矩阵即为若当标准型矩阵.(3)当F是代数闭域时,A存在相应的Jordan-Chevalley分解.进一步,该结论在完全域上仍成立.这些研究推广了有限维向量空间上线性变换的相关结果.     

Factorization of involutions in characteristic two orthogonal groups: An application of the Jordan form to group theory

This paper uses the theory of the Jordan canonical form for a matrix and the theory of orthogonal sums of isometries in metric vector spaces (quadratic spaces) in order to prove a theorem on the factorization of involutions in the orthogonal groups of metric vector spaces over fields of characteristic two. Using this theorem, a classification scheme for such involutions is devised. This scheme is similar to the scheme for involutions when the field is of characteristic not equal of two.     

Jordan canonical form of Pascal-type matrices via sequences of binomial type

In this paper, we study the Jordan canonical form of the generalized Pascal functional matrix associated with a sequence of binomial type, and demonstrate that the transition matrix between the generalized Pascal functional matrix and its Jordan canonical form is the iteration matrix associated with the binomial sequence. In addition, some combinatorial identities are derived from the corresponding matrix factorization.     

复向量空间的分解与复线性变换的Jordan标准形*

本文引入表征复线性变换结构的新对象。这些新对象给出复向量空间关于复线性变换分解的新结果且给出构造Jordan标准形的所有Jordan基。因而,它们能够直接导致着名的Jordan定理及空间的第三分解定理,且能给出对Jordan形精致微妙结构的新的深刻洞察。后者表明,复线性变换的Jordan标准形是一种在双重任意选择下具有不变性的结构。     

The complete equivalence canonical form of four matrices over an arbitrary division ring

In this paper, we give the complete structures of the equivalence canonical form of four matrices over an arbitrary division ring. As applications, we derive some practical necessary and sufficient conditions for the solvability to some systems of generalized Sylvester matrix equations using the ranks of their coefficient matrices. The results of this paper are new and available over the real number field, the complex number field, and the quaternion algebra.     

Multiplicative Jordan Decomposition in Integral Group Ring of Group K_8×C_5

In this article,we present the multiplicative Jordan decomposition in integral group ring of group K8 × C5,where K8 is the quaternion group of order 8.Thus,we give a positive answer to the question raised by Hales A W,Passi I B S and Wilson L E in the paper "The multiplicative Jordan decomposition in group rings II.     

The rational canonical form via the splitting field

It is clear that a given rational canonical form can be further resolved to a Jordan canonical form with entries from the splitting field of its minimal polynomial. Conversely, with an a priori knowledge of the existence and uniqueness of the rational canonical form of a matrix with entries from a general field, one can modify its Jordan canonical form in the splitting field of its minimal polynomial to construct its rational canonical form in the original field. No author has tried this converse with the a priori existence–uniqueness condition removed. It is feared that “in many occasions when, after a result has been established for a matrix with entries in a given field, considered as a matrix with entries in a finite extension of that field, we cannot go back from the extension field to get the desired information in the original field” [I.N. Herstein, Topics in Algebra, Ginn and Company, Waltham, MA, 1964 (pp. 262–263)]. The present paper removes this a priori condition and uses a “symmetrization” to “integrate” back the Jordan canonical form of a matrix to its rational canonical form in the original field.