Abstract
AbstractIn many applications it appears that the initial convergence of preconditioned Krylov solvers is slow. The reason for this is that a number of small eigenvalues are present. After these bad eigenvector components are approximated, the fast superlinear convergence sets in. A way to have fast convergence from the start is to remove these components by a projection. In this paper we give a comparison of some of these projection operators. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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