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math.NA2025
Multiprecision computations with Schwarz methods
Michal Outrata, Daniel B. Szyld
Schwarz methods and preconditioners, where the approximate solution of the local problems is performed at a lower precision, i.e., with fewer digits of accuracy than in the underly…
math.NA2025
Improved Polynomial Bounds and Acceleration of GMRES by Solving a min-max Problem on Rectangles, and by Deflating
Nicole Spillane, Daniel B Szyld
Polynomial convergence bounds are considered for left, right, and split preconditioned GMRES. They include the cases of Weighted and Deflated GMRES for a linear system Ax = b. In p…