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Brief Communications

Deficiency Indices of Block Jacobi Matrices That Do Not Satisfy the Carleman Condition, and Operators with Point Interactions

V. S. Budyka^a, M. M. Malamud^bc, I. L. Pokrovski<sup>d

a</sup> Donetsk State Academy of Management, Donetsk
^b Peoples' Friendship University of Russia, Moscow
^c Saint Petersburg State University
^d Bauman Moscow State Technical University

Keywords: Jacobi matrix, deficiency indices, Schrödinger and Dirac operators, point interaction.

MSC: 34L05; 34L40; 47A05; 47A10; 47B36

Received: 23.05.2023

DOI: 10.4213/mzm14040

 English version: Mathematical Notes, 2023, 114:5, 1060–1066

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