For nonsymmetric and indefinite two-level solvers, interpolation and restriction built from generalized eigenvectors of (A,M) are proved optimal in a family of norms, with tight convergence factor |1−λ_{nc+1}|^{ν1+ν2}.
Axelsson , A survey of algebraic multilevel iteration ( AMLI ) methods , BIT Numerical Mathematics, 43 (2003), pp
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Optimal transfer operators in algebraic two-level methods for nonsymmetric and indefinite problems
For nonsymmetric and indefinite two-level solvers, interpolation and restriction built from generalized eigenvectors of (A,M) are proved optimal in a family of norms, with tight convergence factor |1−λ_{nc+1}|^{ν1+ν2}.