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Spectral properties of the preconditioned AHSS iteration method for generalized saddle point problems. (English) Zbl 1202.65043

The authors analyse an accelerated skew-Hermitian splitting (AHSS) preconditioner for the numerical solution of generalized saddle point systems. They prove that all eigenvalues of the preconditioned matrices are very clustered with any positive iteration parameters.

MSC:

65F10 Iterative numerical methods for linear systems
65F50 Computational methods for sparse matrices
65F08 Preconditioners for iterative methods
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