scientific article

zbMATH Open0599.47025MaRDI QIDQ3733566

G. V. Virabyan

Publication date: 1980

Title of this publication is not available (Why is that?)

zbMATH Keywords

completeness of root vectorsnonselfadjoint quadratic matrix operatorsSymmetric perturbations of selfadjoint nonbounded matrix operators

Mathematics Subject Classification ID

Perturbation theory of linear operators (47A55) Functions whose values are linear operators (operator- and matrix-valued functions, etc., including analytic and meromorphic ones) (47A56) (Generalized) eigenfunction expansions of linear operators; rigged Hilbert spaces (47A70)

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