Comment on ‘Preconditioning of matrices partitioned in 2 Œ 2 block form: Eigenvalue estimates and Schwarz DD for mixed FEM’ by Owe Axelsson,Radim Blaheta |
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| Authors: | Zhi‐Hao Cao |
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| Affiliation: | School of Mathematical Sciences and Laboratory of Mathematics for Nonlinear Sciences, Fudan University, , Shanghai 200433, China |
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| Abstract: | In this note, we discuss the inverse representations of regularized saddle point matrices and point out that some conclusions given by Axelsson and Blaheta in [Numerical Linear Algebra with Applications, 2010,17:787–810 ] are not true.Copyright © 2011 John Wiley & Sons, Ltd. |
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| Keywords: | Saddle point matrices regularization block preconditioners |
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