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zbMath0649.47014MaRDI QIDQ3794764

I. D. Tsopanov, V. A. Lyubishkin

Publication date: 1987

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

Laplace operator Sturm-Liouville operator selfadjoint operator with a discrete spectrum T-trace

Mathematics Subject Classification ID

Spectrum, resolvent (47A10) Perturbation theory of linear operators (47A55)

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