Abstract
This paper presents a new result concerning the perturbation theory of M-matrices. We give the proof of a theorem showing that some perturbations of irreducibly diagonally dominant M-matrices are monotone, together with an explicit bound of the norm of the perturbation. One of the assumptions concerning the perturbation matrix is that the sum of the entries of each of its row is nonnegative. The resulting matrix is shown to be monotone, although it may not be diagonally dominant and its off diagonal part may have some positive entries. We give as an application the proof of the second order convergence of an non-centered finite difference scheme applied to an elliptic boundary value problem.
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Bouchon, F. Monotonicity of some perturbations of irreducibly diagonally dominant M-matrices. Numer. Math. 105, 591–601 (2007). https://doi.org/10.1007/s00211-006-0048-8
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DOI: https://doi.org/10.1007/s00211-006-0048-8