Spectral points of definite type and type π for linear operators and relations in Krein spaces

Azizov, Tomas Ya; Behrndt, Jussi GND; Jonas, Peter; Trunk, Carsten GND

Spectral points of type \pi_+ and type \pi_− for closed linear operators and relations in Krein spaces are introduced with the help of approximative eigensequences. It turns out that these spectral points are stable under compact perturbations and perturbations small in the gap metric.

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Azizov Prof. Dr., T.Y., Behrndt Univ.-Prof. Dr., J., Jonas Priv.-Doz., P., Trunk Univ.-Prof. Dr. rer. nat. habil., C., 2008. Spectral points of definite type and type $\pi$ for linear operators and relations in Krein spaces. Preprint /  Technische Universität Ilmenau, Institut für Mathematik, Preprint /  Technische Universität Ilmenau, Institut für Mathematik 08–12.
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