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Some properties of Schur complements and diagonal-Schur complements of diagonally dominant matrices

机译:对角占优矩阵的Schur补和对角Schur补的一些性质

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In this paper, we prove that the diagonal-Schur complement of a strictly doubly diagonally dominant matrix is strictly doubly diagonally dominant matrix. The same holds for the diagonal-Schur complement of a strictly generalized doubly diagonally dominant matrix and a nonsingular H-matrix. We point out that under certain assumptions, the diagonal-Schur complement of a strictly doubly (doubly product) gamma-diagonally dominant matrix is also strictly doubly (doubly product) gamma-diagonally dominant. Further, we provide the distribution of the real parts of eigenvalues of a diagonal-Schur complement of H-matrix. We also show that the Schur complement of a gamma-diagonally dominant matrix is not always gamma-diagonally dominant by a numerical example, and then obtain a sufficient condition to ensure that the Schur complement of a gamma-diagonally dominant matrix is gamma-diagonally dominant. (c) 2007 Elsevier Inc. All rights reserved.
机译:在本文中,我们证明了严格双重对角占优矩阵的对角Schur补是严格双重对角占优矩阵。严格广义双对角占优矩阵和非奇异H矩阵的对角Schur补码也是如此。我们指出,在某些假设下,严格双重(双重乘积)γ-对角占优矩阵的对角-舒尔补数也严格地双重(双重乘积)γ-对角占优。此外,我们提供了H矩阵对角线Schur补的特征值实部的分布。我们还通过数值示例表明,γ-对角占优矩阵的Schur补体并不总是γ-对角占优,然后获得足够的条件以确保γ-对角占优的矩阵的Schur补体是γ-对角占优的。 (c)2007 Elsevier Inc.保留所有权利。

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