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Symmetric part preconditioning for the conjugate gradient method in Hilbert space. (English) Zbl 1054.65055

The conjugate gradient method for nonsymmetric linear operators in Hilbert space is investigated. The focus is on preconditioning by the symmetric part of the operator, in which case estimates are given for the resulting condition number. An important motivation for this study is given by differential operators, for which the obtained estimates yield mesh independent conditioning properties of the full conjugate gradient method, and are in fact achieved by the simpler truncated version. As an application of the general theory, the conjugate gradient method is used for certain linear elliptic operators on the continuous level in Sobolev spaces.

MSC:

65J10 Numerical solutions to equations with linear operators
47A50 Equations and inequalities involving linear operators, with vector unknowns
Full Text: DOI

References:

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