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math.NA2023★ 1 cited
Generalized Golub-Kahan bidiagonalization for nonsymmetric saddle point systems
Andrei Dumitrasc, Carola Kruse, Ulrich Ruede
The generalized Golub-Kahan bidiagonalization has been used to solve saddle-point systems where the leading block is symmetric and positive definite. We extend this iterative metho…
math.NA2023★ 3 cited
Deflation for the off-diagonal block in symmetric saddle point systems
Andrei Dumitrasc, Carola Kruse, Ulrich Ruede
Deflation techniques are typically used to shift isolated clusters of small eigenvalues in order to obtain a tighter distribution and a smaller condition number. Such changes induc…