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arXiv · 2609.24751

Constraints on admissible behavior of GMRES applied to tridiagonal Toeplitz systems

Fei Chen·Kirk M. Soodhalter
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Abstract

The result of Greenbaum and Strakoš that for a given set of eigenvalues, any convergence curve is possible [SIMAX 1996] and the subsequent parameterization of such matrix-right-hand side pairs $(A,\mathbf{b})$ of Arioli, Pták, and Strakoš [BIT 1998] demonstrated that the behavior of the \gmres could not be completely characterized by the eigenvalues of $A$ alone. In this paper, we consider how to use this theory to understand the admissible and attainable \gmres behavior for matrices with constrained structure, focussing on non-Hermitian (non-symmetric) tridiagonal Toeplitz matrices. We show that Toeptliz structure necessarily constrains the how the theory from these papers can manifest but that a continuum of admissible behaviors is still attainable.

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Fei Chen, Kirk M. Soodhalter. 2026-09-21. Constraints on admissible behavior of GMRES applied to tridiagonal Toeplitz systems. https://arxiv.org/abs/2609.24751

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