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1.
给出了矩阵函数f(X)=A-BX-(BX)*的秩和最小惯性指数定理,其中*表示矩阵的共轭转置.作为应用,给出了Lyapunov矩阵方程以及矩阵不等式BX+(BX)*≥A和BX+(BX)*≤A可解的若干充要条件.  相似文献   

2.
四元数自共轭矩阵和的特征值的不等式   总被引:1,自引:0,他引:1  
本文将Wietandt关于复自共轭矩阵的特征值和的变分特征以及和的特征值的不等式推广到四元数体上,由此还给出了复自共轭矩阵的主对角元与特征值的优化关系的Schur定理、复矩阵的主对角元的模与奇异值的优化关系的Fan定理在四元数体上的推广.  相似文献   

3.
将 Wielandt-Hoffman定理的一种对称形式推广到四元数体上 ,得到了自共轭矩阵二项式的广义F—范数估计定理和一个幂迹定理 .  相似文献   

4.
本文将Wielandt-Hoffman定理的一种对称形式推广到四元数体上,得到了自共轭矩阵二项式的广义F-范数估计定理和一个幕迹定理.  相似文献   

5.
黄礼平 《数学研究》1995,28(3):33-35
本文推广复矩阵凸函数及其性质到四元数体上矩阵,并且得到关于四元数矩阵凸函数的一些不等式.  相似文献   

6.
关于四元数自共轭矩阵乘积迹和特征值的几个定理   总被引:2,自引:0,他引:2  
给出四元数自共轭矩阵乘积迹的几个定理及特征值之界的几个新估计,在四元数体上改进和推广了文[1-12]的相应结果  相似文献   

7.
四元数体上的矩阵及其优化理论   总被引:9,自引:0,他引:9  
刘建洲 《数学学报》1992,35(6):831-838
本文引入了四元数体 Q 上的广义双随机矩阵,给出了它与优化的关系.由此,我们得出了四元数矩阵奇异值的一些重要不等式,特别是得出了四元数矩阵的和与积的奇异值不等式.我们还讨论了四元数自共轭矩阵的和与积的特征值等.推广了复数域上矩阵的许多著名结果.  相似文献   

8.
廖祖华 《大学数学》2002,18(5):42-48
将复数域及四元数体上矩阵的积因子分解推广到了环上矩阵 .并指出了 [1 ]中的定理 2的证明是错误的 ,由此可知 [1 ]中定理 2的结论不成立 .  相似文献   

9.
四元数矩阵的特征值与奇异值不等式   总被引:13,自引:0,他引:13  
关于复矩阵特征值与奇异值不等式的研究,[1]中已有既系统又较深入的综述。四元数矩阵的特征值,自[2]、[3]的工作以来,近三十年中进展甚微,其特征值不等式至今未见论述。近些年来,由于体上矩阵标准形理论研究的进展,谢先生在[5]中定义了体上一类矩阵的特征值,使得这方面的研究又有了新的势头。本文就是在[5]的特征值定义下,对四元数矩阵的特征值与奇异值不等式作些考察,将复矩阵论中著名的特征值Cauchy交错定理,奇异值Thompson交错定理以及惯性律的Ostrowski数量公式推广到四元数体H上。  相似文献   

10.
四元数矩阵的实表示与四元数矩阵方程   总被引:7,自引:0,他引:7  
四元数矩阵与四元数矩阵方程在力学和工程问题的理论研究和实际数值计算中都起到重要的作用.该文借助四元数矩阵的实表示方法,研究了一般四元数矩阵方程AXB-CYD=E的解的问题,给出了一种求解四元数矩阵方程的算法技巧.该文还得到了四元数矩阵的Roth's定理.  相似文献   

11.
We propose a new inertia‐revealing factorization for sparse symmetric matrices. The factorization scheme and the method for extracting the inertia from it were proposed in the 1960s for dense, banded, or tridiagonal matrices, but they have been abandoned in favor of faster methods. We show that this scheme can be applied to any sparse symmetric matrix and that the fill in the factorization is bounded by the fill in the sparse QR factorization of the same matrix (but is usually much smaller). We describe our serial proof‐of‐concept implementation and present experimental results, studying the method's numerical stability and performance.  相似文献   

12.
This paper is concerned with the problem of attitude control and disturbance rejection of rigid spacecraft in the presence of parameter uncertainty. It is assumed that the external disturbance is generated by some time varying exosystems. The unit quaternion is used as the kinematic variables since it is free of singularity. An internal model and an adaptive control law are proposed. The parameter uncertainty caused by the unknown inertia matrix is handled by combining the semi-tensor product and adaptive control method. The asymptotical stability of the closed-loop system is given via backstepping and Lyapunov analysis. Finally, an illustrative example is provided to show the effectiveness of the proposed approach.  相似文献   

13.
In the theory of the separation of roots of algebraic equations, the well-known Routh–Hurwitz–Fujiwara theorem enables us to separate the complex roots of a polynomial with complex coefficients in terms of the inertia of a related Hermitian matrix. Unfortunately, it fails if the polynomial has a nontrivial factor which is symmetric with respect to the imaginary axis. In this article, we present a method to overcome the fault and formulate the inertia of a scalar polynomial with complex coefficients in terms of the inertia of several Hermitian matrices based on a factorization of a monic symmetric polynomial into products of monic symmetric polynomials with only simple roots in the complex plane and on computing the inertia of each factor by means of a subtle perturbation.  相似文献   

14.
A matrix whose entries consist of elements from the set {+, −, 0} is a sign pattern matrix. Using a linear algebra theoretical approach we generalize of some recent results due to Hall, Li and others involving the inertia of symmetric tridiagonal sign matrices.  相似文献   

15.
This paper derives a theorem of generalized singular value decomposition of quaternion matrices(QGSVD),studies the solution of general quaternion matrix equation AXB-CYD=E,and obtains quaternionic Roth's theorem.This paper also suggestssufficient and necessary conditions for the existence and uniqueness of solutions and explicit forms of the solutions of the equation.  相似文献   

16.
This paper derives a theorem of generalized singular value decomposition of quaternion matrices (QGSVD),studies the solution of general quaternion matrix equation AXB -CYD= E,and obtains quaternionic Roth's theorem. This paper also suggests sufficient and necessary conditions for the existence and uniqueness of solutions and explicit forms of the solutions of the equation.  相似文献   

17.
INERTIA SETS OF SYMMETRIC SIGN PATTERN MATRICES   总被引:2,自引:0,他引:2  
1 IntroductionIn qualitative and combinatorial matrix theory,we study properties ofa matrix basedon combinatorial information,such as the signs of entries in the matrix.A matrix whoseentries are from the set{ + ,-,0 } is called a sign pattern matrix ( or sign pattern,or pat-tern) .We denote the setof all n× n sign pattern matrices by Qn.For a real matrix B,sgn( B) is the sign pattern matrix obtained by replacing each positive( respectively,negative,zero) entry of B by+ ( respectively,-,0 )…  相似文献   

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