Preconditioning of matrices partitioned in 2 × 2 block form: eigenvalue estimates and Schwarz DD for mixed FEM

  title={Preconditioning of matrices partitioned in 2 × 2 block form: eigenvalue estimates and Schwarz DD for mixed FEM},
  author={Owe Axelsson and Radim Blaheta},
  journal={Numerical Lin. Alg. with Applic.},
A general framework for constructing preconditioners for 2×2 block matrices is presented, and eigenvalue bounds of the preconditioned matrices are derived. The results are applied both for positive-definite problems and for saddle point matrices of regularized forms. Eigenvalues and minimal polynomials for certain limit cases are derived. A domain decomposition method, with overlap, is used to solve the pivot block of the regularized matrix. Special attention is paid to problems with… CONTINUE READING

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