Loghin, Daniel

We discuss and extend the results derived in Keller, Gould and Wathen [SIMAX, 21(4), 2000] for constraint preconditioning. In particular, we improve the existing results as well as generalise them to the case where the (1,1) block of the preconditioner has a non-trivial kernel. We also analyse the form of the preconditioner with negated constraints, which ensures that the preconditioned system is diagonalisable, while preserving the non-unit eigenvalues and negating some unit eigenvalues

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A note on constraint preconditioning

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http://pure-oai.bham.ac.uk/ws/files/42904144/cprecnote_rev3.pdf

A note on constraint preconditioning

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