3 papers
math.NA2026
Stabilizing randomized GMRES through flexible GMRES
Stefan Güttel, John W. Pearson
We explore the use of flexible GMRES as an outer wrapper for sketched GMRES. Building on a new bound for the residual of FGMRES in terms of the residual of the preconditioner, we d…
math.NA2026
Block Alpha-Circulant Preconditioners for All-at-Once Diffusion-Based Covariance Operators
Jemima M. Tabeart, Selime Gürol, John W. Pearson +1
Covariance matrices are central to data assimilation and inverse methods derived from statistical estimation theory. Previous work has considered the application of an all-at-once…
math.NA2026
Parallel-in-Time Preconditioning for Time-Dependent Variational Mean Field Games
Heidi Wolles Ljósheim, Dante Kalise, John W. Pearson +1
We study the numerical approximation of a time-dependent variational mean field game system with local couplings and either periodic or Neumann boundary conditions. Following a var…