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

Authors

  • Zhi-Hao Cao

    Corresponding author
    • School of Mathematical Sciences and Laboratory of Mathematics for Nonlinear Sciences, Fudan University, Shanghai 200433, China
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  • This work is supported by NSFC Project 10471027.

Correspondence to: Zhi-Hao Cao, School of Mathematical Sciences and Laboratory of Mathematics for Nonlinear

Sciences, Fudan University, Shanghai 200433, China.

E-mail:zcao@fudan.edu.cn

SUMMARY

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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