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.
Trian- gular preconditioners for double saddle point linear systems arising in the mixed form of poroelasticity equations, 05 2025
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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.