H-矩阵的刻化及一类实矩阵逆的上下界估计

 H-矩阵是一类有很强应用背景的矩阵,首先利用矩阵的分裂刻划了H-矩阵;然后给出了更精确的H-矩阵逆的上下界估计;进而把该结论推广到一类实矩阵.所用方法不同于以往有关结论,并改进了最近的相关结果.     

A two-step modulus-based multisplitting iteration method for the nonlinear complementarity problem

In this paper, we construct a two-step modulus-based multisplitting iteration method based on multiple splittings of the system matrix for the nonlinear complementarity problem. And we prove its convergence when the system matrix is an $H$-matrix with positive diagonal elements. Numerical experiments show that the proposed method is efficient.     

On diagonal-Schur complements of block diagonally dominant matrices

It is known that the diagonal-Schur complements of strictly diagonally dominant matrices are strictly diagonally dominant matrices [J.Z. Liu, Y.Q. Huang, Some properties on Schur complements of H-matrices and diagonally dominant matrices, Linear Algebra Appl. 389 (2004) 365-380], and the same is true for nonsingular H-matrices [J.Z. Liu, J.C. Li, Z.T. Huang, X. Kong, Some properties of Schur complements and diagonal-Schur complements of diagonally dominant matrices, Linear Algebra Appl. 428 (2008) 1009-1030]. In this paper, we research the properties on diagonal-Schur complements of block diagonally dominant matrices and prove that the diagonal-Schur complements of block strictly diagonally dominant matrices are block strictly diagonally dominant matrices, and the same holds for generalized block strictly diagonally dominant matrices.     

非奇异H-矩阵新的迭代判定法

非奇异H-矩阵在科学和工程的实际应用中发挥着重要作用.近期一些迭代法被用于判别非奇异H-矩阵.提出新的实用迭代公式,推广和改进了已有的相关结果.     

Parallel Multisplitting AOR method for solving a class of system of nonlinear algebraic equations

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一类求解非线性代数方程组的并行多分裂AOR算法

本文提出了求解大型非线性代数方程组Aф(x)+Bψ(x)=b的并行多分裂AOR(Accelerated Overrela Xation)算法。在一定的条件下,证明了非线性代数方程组解的存在唯一性,并建立了新算法的全局收敛性理论。     

改进的Gauss-Seidel迭代法对H-矩阵的收敛性定理

 1997年,Kohno等人对一类非奇异对角占优Z-矩阵的Gauss-Seidel迭代法作出了改进,这种方法被称为IMGS方法.本文考虑对一类应用更广泛的矩阵——H-矩阵的Gauss-Seidel迭代法做出改进,得到了收敛性结果,并比较了参数α_i与SOR方法的参数ω的选择范围     

非 奇 异 H-矩 阵 的 判 定

利用不可约对角占优矩阵和具有非零元素链的对角占优矩阵均为非奇异H-矩阵的性质, 给出了关于非奇异H 矩阵的新的判定条件.     

非奇异H-矩阵的充分必要判据

设A=(aij)∈Cn×n,若存在α∈(0,1),使i≠j(i,j∈N={1,2,…,n}),有aii.ajj>[αΛi(A)+(1-α)Si(A)].[αΛj(A)+(1-α)Sj(A)],则称A为严格α-双对角占优矩阵。首先推广严格α-双对角占优矩阵的概念到广义α-双对角占优矩阵;然后得到了判别广义α-双对角占优矩阵的一个充分必要条件,进而可以判断非奇异H-矩阵,改进和推广了已有的结论,进一步丰富和完善了α-双对角占优矩阵的理论。     

非奇异H-矩阵判定的充分条件

给出了非奇异H-矩阵判定的充分条件,并用数值例子说明了结果的有效性。