scientific article; zbMATH DE number 953179

zbMath0861.47015MaRDI QIDQ4718122

Hassi, Seppo, Hendrik S. V. de Snoo, Heinz K. Langer

Publication date: 7 January 1997

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zbMATH Keywords

perturbationsdefect numbersFriedrichs extensionoperator modelNevanlinna functions\(Q\)-functionselfadjoint extensionclosed symmetric operatorsemiboundedcompletely nonselfadjoint

Mathematics Subject Classification ID

Hermitian and normal operators (spectral measures, functional calculus, etc.) (47B15) Perturbation theory of linear operators (47A55) Linear symmetric and selfadjoint operators (unbounded) (47B25) Eigenfunctions, eigenfunction expansions, completeness of eigenfunctions of ordinary differential operators (34L10) Linear operator methods in interpolation, moment and extension problems (47A57) Dilations, extensions, compressions of linear operators (47A20)

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