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.
A class of block alternating splitting im- plicit iteration methods for double saddle point linear systems.Numerical Linear Algebra with Applications, 30(1):e2455, 2023
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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.