"Preconditioners for regularized saddle point matrices"@en . "2" . . . "1570-2820" . "RIV/68145535:_____/11:00361645!RIV12-AV0-68145535" . . . . "saddle point matrices; preconditioning; regularization; eigenvalue clustering"@en . . . "Axelsson, Owe" . "Saddle point problems with singular or indefinite pivot blockmatrix arise in various applications. In some problems it may be necessary to regularize the corresponding matrix is some way. By straightforward derivations it is shown that use of certain preconditioners on block diagonal and block triangular form can be very efficient, both for the original matrix and for its regularized forms. As the value of regularization parameter increases, the eigenvalues cluster at unity or at just two points on the real line." . "000292773100001" . "222676" . . "Saddle point problems with singular or indefinite pivot blockmatrix arise in various applications. In some problems it may be necessary to regularize the corresponding matrix is some way. By straightforward derivations it is shown that use of certain preconditioners on block diagonal and block triangular form can be very efficient, both for the original matrix and for its regularized forms. As the value of regularization parameter increases, the eigenvalues cluster at unity or at just two points on the real line."@en . "DE - Spolkov\u00E1 republika N\u011Bmecko" . . "23"^^ . "Preconditioners for regularized saddle point matrices" . "http://www.degruyter.com/view/j/jnma.2011.19.issue-2/jnum.2011.005/jnum.2011.005.xml" . . . "Preconditioners for regularized saddle point matrices"@en . "19" . . . . . "Preconditioners for regularized saddle point matrices" . "1"^^ . "Z(AV0Z30860518)" . "[D27D27D8166B]" . "Journal of Numerical Mathematics" . "Axelsson, Owe" . . "1"^^ . "10.1515/JNUM.2011.005" . "RIV/68145535:_____/11:00361645" .