A classification of symmetric double saddle-point systems into block-arrow and block-tridiagonal matrix forms is presented, including invertibility conditions, spectral properties, and block preconditioners.
On the improvement of shift- splitting preconditioners for double saddle point problems.Journal of Ap- plied Mathematics and Computing, 70:1339–1363
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Classification of Double Saddle-Point Systems
A classification of symmetric double saddle-point systems into block-arrow and block-tridiagonal matrix forms is presented, including invertibility conditions, spectral properties, and block preconditioners.