A rank-r coarse space built from the top singular modes of the local scattering map makes the GOSM skeleton operator identity-plus-compact, giving superlinear GMRES convergence with explicit bounds.
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Coarse space preconditioning for Generalized Optimized Schwarz Methods. Part I: continuous case
A rank-r coarse space built from the top singular modes of the local scattering map makes the GOSM skeleton operator identity-plus-compact, giving superlinear GMRES convergence with explicit bounds.