Flexible GMRES exhibits two phases of convergence, with a sharp residual bound that is geometric for tight inner tolerances and more pronounced in two phases for looser tolerances, and the bound is shown to be unimprovable with an equality example.
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Flexible GMRES converges in two phases
Flexible GMRES exhibits two phases of convergence, with a sharp residual bound that is geometric for tight inner tolerances and more pronounced in two phases for looser tolerances, and the bound is shown to be unimprovable with an equality example.