On convergence of spectral expansions of Dirac operators with regular boundary conditions

Alexander Makin

Mathematische Nachrichten, 2022, vol. 295, issue 1, 189-210

Abstract: Spectral problems for the Dirac operator with regular but not strongly regular boundary conditions and complex‐valued potential summable over a finite interval are considered. The purpose of this paper is to find conditions under which the root function system forms a usual Riesz basis rather than a Riesz basis with parentheses.

Date: 2022
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