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math.NA2025
Concentrated real-pole uniform-in-time approximation of the matrix exponential
Stefan Güttel, Shuai Shao
We propose an asympotically optimal choice of shared concentrated real poles of a family of rational approximants of time-dependent exponential functions for …
math.NA2025
fastGMRES: Robust randomized GMRES via flexible GMRES
Stefan Güttel, John W. Pearson
We propose a practical randomized algorithm for solving large sparse systems of linear equations. The algorithm, termed fastGMRES, uses flexible GMRES as an outer wrapper for sketc…