Summary.
The GMRES method is a popular iterative method for the solution of large linear systems of equations with a nonsymmetric nonsingular matrix. However, little is known about the behavior of this method when it is applied to the solution of nonsymmetric linear ill-posed problems with a right-hand side that is contaminated by errors. We show that when the associated error-free right-hand side lies in a finite-dimensional Krylov subspace, the GMRES method is a regularization method. The iterations are terminated by a stopping rule based on the discrepancy principle.
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Received November 10, 2000 / Revised version received April 11, 2001 / Published online October 17, 2001
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Calvetti, D., Lewis, B. & Reichel, L. On the regularizing properties of the GMRES method. Numer. Math. 91, 605–625 (2002). https://doi.org/10.1007/s002110100339
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DOI: https://doi.org/10.1007/s002110100339