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.
Schur complement preconditioners for multiple saddle point problems of block tridiagonal form with application to optimization problems.arXiv e-prints, 2017
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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.