- Abstract:
- Block lower triangular and block upper triangular matrices are popular preconditioners for nonsymmetric saddle point matrices. In this note we show that a block lower triangular preconditioner gives the same spectrum as a block upper triangular preconditioner and that the eigenvectors of the two preconditioned systems are related.
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- Publication date:
- 2013-01-01
- URN:
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uuid:843d4b98-f7fa-46a3-9a6d-b785529a2e9c
- Local pid:
- oai:eprints.maths.ox.ac.uk:1727
- Copyright date:
- 2013
Journal article
On the eigenvalues and eigenvectors of nonsymmetric saddle point matrices preconditioned by block triangular matrices
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