Abstract
Maximal accretive and dissipative extensions of symmetric relations defined by abstract boundary conditions are considered in Hubert space. Under the assumption that the resolvent of some extension has properties such as belonging to the Neumann-Shatten ideal or having given asymptotics of the s-numbers, either sufficient or necessary and sufficient conditions are found for a perturbation of the boundary conditions guaranteeing that the above properties are preserved for the resolvent of the perturbed extension.
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F. S. Rofe-Beketov, “Self-adjoint extensions of differential operators in a space of vector-functions,” Dokl. Akad. Nauk SSSR,184, No. 5, 1034–1037 (1969).
M. L. Gorbachuk, A. N. Kochubei, and M. A. Rybak, “Dissipative extensions of differential operators in a space of vector-functions,” Dokl. Akad. Nauk SSSR,205, No. 5, 1029–1032 (1972).
R. Arens, “Operational calculus of linear relations,” Pac. J. Math.,11, No. 1, 9–23 (1961).
A. Dijksma and H. S. V. de Snoo, “Self-adjoint extensions of symmetric subspaces,” Pac. J. Math.,54, No. 1, 71–100 (1974).
V. M. Bruk, “On a class of boundary problems with spectral parameter in the boundary condition,” Mat. Sb.,100, No. 2, 210–216 (1976).
A. N. Kochubei, “Extensions of symmetric operators and symmetric binary relations,” Mat. Zametki,17, No. 1, 41–48 (1975).
M. L. Gorbachuk, “Self-adjoint boundary problems for a second-order differential equation with an unbounded operator coefficient,” Funkts. Anal. Prilozhen.,5, No. 1, 10–21 (1971).
V. I. Gorbachuk and M. L. Gorbachuk, “Some problems in the spectral theory of differential equations of elliptic type in a space of vector-functions over a finite interval,” Ukr. Mat. Zh.,28, No. 1, 12–26 (1976).
I. C. Gohberg and M. G. Krein, Introduction to the Theory of Linear Nonselfadjoint Operators, Amer. Math. Soc. (1969).
C. Bennewitz, “Symmetric relations on a Hubert space,” in: Conf. Theory Ordinary and Partial Diff. Eqs., Lecture Notes in Mathematics, Vol. 280, Springer-Verlag, New York (1972), pp. 212–218.
I. M. Glazman, Direct Methods of Qualitative Spectral Analysis of Singular Differential Operators [in Russian], Fizmatgiz, Moscow (1963).
A. N. Kochubei, “On the spectrum of the self-adjoint extensions of a symmetric operator,” Mat. Zametki,19, No. 3, 429–434 (1976).
V. I. Gorbachuk and M. L. Gorbachuk, “On some classes of boundary problems for a Sturm-Liouville equation with an operator potential,” Ukr. Mat. Zh.,24, No. 3, 291–305 (1972).
V. I. Gorbachuk and M. L. Gorbachuk, “On self-adjoint boundary problems with discrete spectrum generated by a Sturm-Liouville equation with an unbounded operator coefficient,” Funkts. Anal. Prilozhen.,5, No. 4, 67–68 (1971).
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Translated from Matematicheskie Zametki, Vol. 22, No. 6, pp. 825–834, December, 1977.
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Bruk, V.M. Extensions of symmetric relations. Mathematical Notes of the Academy of Sciences of the USSR 22, 953–958 (1977). https://doi.org/10.1007/BF01099564
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DOI: https://doi.org/10.1007/BF01099564