Convergence properties of Krylov subspace methods for singular linear systems with arbitrary index
Necessary and sufficient conditions for the convergence of a sequence of solutions of a Krylov subspace method for the numerical solution of singular linear systems are derived. Convergence is proven to a vector involving the Drazin inverse of the singular coefficient matrix. Convergence bounds for the QMR and TFQMR algorithm are given.
scientific article; zbMATH DE number 1419823
scientific article