An improved lower bound on a positive stable block triangular preconditioner for saddle point problems. (English) Zbl 1252.65067

Summary: In this paper, a new lower bound on a positive stable block triangular preconditioner for saddle point problems is derived; it is superior to the corresponding result obtained by Z.-H. Cao [Appl. Numer. Math. 57, No. 8, 899–910 (2007; Zbl 1118.65021)]. A numerical example is reported to confirm the presented result.


65F08 Preconditioners for iterative methods


Zbl 1118.65021


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