Abstract
We use verified computations and the Lanczos process to obtain guaranteed lower and upper bounds on the 2-norm and the energy-norm error of an approximate solution to a symmetric positive definite linear system. The upper bounds require the a priori knowledge of a lower bound on the smallest eigenvalue.
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Frommer, A., Weinberg, A. Verified Error Bounds for Linear Systems Through the Lanczos Process. Reliable Computing 5, 255–267 (1999). https://doi.org/10.1023/A:1009976221447
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DOI: https://doi.org/10.1023/A:1009976221447