A Note on Constraint Preconditioning for Nonsymmetric Indefinite Matrices
Zhi‐Hao Cao · SIAM Journal on Matrix Analysis and Applications · 2002
The constraint preconditioner for indefinite linear systems in [C. Keller, N. I. M. Gould, and A. J. Wathen, SIAM J. Matrix Anal. Appl., 21 (2000), pp. 1300--1317] is extended to nonsymmetric matrices.