Given a nonsymmetric matrix A, we investigate the effect of perturbations on an invariant subspace of A. The result derived in this paper differs from Stewart's classical result and sometimes yields tighter bounds. Moreover, we provide norm estimates for the remainder terms in well-known perturbation expansions for invariant subspaces, eigenvectors, and eigenvalues.
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Qatar Univ, Coll Arts & Sci, Math Program, Dept Math Stat & Phys, Doha 2713, QatarQatar Univ, Coll Arts & Sci, Math Program, Dept Math Stat & Phys, Doha 2713, Qatar
Al-Dweik, Ahmad Y.
Ghanam, Ryad
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Virginia Commonwealth Univ Qatar, Dept Liberal Arts & Sci, Doha 8095, QatarQatar Univ, Coll Arts & Sci, Math Program, Dept Math Stat & Phys, Doha 2713, Qatar
Ghanam, Ryad
Thompson, Gerard
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Univ Toledo, Dept Math, Toledo, OH 43606 USAQatar Univ, Coll Arts & Sci, Math Program, Dept Math Stat & Phys, Doha 2713, Qatar
Thompson, Gerard
Azad, Hassan
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Govt Coll Univ, Abdus Salam Sch Math Sci, Lahore 54600, PakistanQatar Univ, Coll Arts & Sci, Math Program, Dept Math Stat & Phys, Doha 2713, Qatar