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Publication:3663899
zbMath0516.47021MaRDI QIDQ3663899
Heinz K. Langer, Branko Najman
Publication date: 1983
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
spectral functionstrong resolvent convergencePontrjagin spacesdefinitizable selfadjoint operators in Krein spacesperturbations of second order differential equations in Hilbert spacesperturbations of selfadjoint operators in Krein spaceTrotter-Kato theorem on the convergence of unitary groups
Perturbation theory of linear operators (47A55) Linear operators on spaces with an indefinite metric (47B50)
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