ARENAS, ISNARDO; CASTILLO, PAUL    YONG, XUERONG. An extension of the I + S_max preconditioner for the Gauss-Seidel method. []. , 31, 1, pp.1-14. ISSN 0120-419X.

. A preconditioning technique based on the application of a fixed but arbitrary number of I +S_max steps is proposed. A reduction of the spectral radius of the Gauss-Seidel iteration matrix is theoretically analyzed for diagonally dominant Z-matrices. In particular, it is shown that after a finite number of steps this matrix reduces to null matrix. To illustrate the performance of the proposed technique numerical experiments on a wide variety of matrices are presented. Point and block versions of the preconditioner are numerically studied.

: Preconditioning; Gauss-Seidel method; regular splitting; point and block preconditioners.

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