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- W2893418946 abstract "Recently, variants of shift-splitting iteration method have been proposed for solving singular saddle-point problems. However, these methods can only be proved to converge to one of the solutions of the consistent singular linear system, not knowing any further information about this solution. In this work, we consider a modified preconditioned generalized shift-splitting (MPGSS) iteration method for solving both consistent and inconsistent singular saddle-point problems. This method is proved to converge to the best least squares solution. Moreover, based on the iteration form, a preconditioner is obtained to accelerate Krylov subspace methods. Theoretical analysis shows that the preconditioned GMRES method also converges to the best least squares solution of the consistent singular saddle-point problem. In addition, numerical results are presented to show the effectiveness and robustness of the proposed iteration method and preconditioner." @default.
- W2893418946 created "2018-10-05" @default.
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- W2893418946 date "2019-01-01" @default.
- W2893418946 modified "2023-09-26" @default.
- W2893418946 title "Convergence analysis of modified PGSS methods for singular saddle-point problems" @default.
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- W2893418946 doi "https://doi.org/10.1016/j.camwa.2018.09.016" @default.
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