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, Tomas Ya / Behrndt, Jussi / Jonas, Peter / et al: Spectral points of definite type and type π for linear operators and relations in Krein spaces. 2008.

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