Geodesic
Regular boundary value problems for the Dirac operator
Doklady Rossijskoj akademii nauk. Matematika, informatika, processy upravleniâ, Tome 492 (2020), pp. 49-53.

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Spectral problems for the Dirac operator specified on a finite interval with regular, but not strongly regular boundary conditions and a complex-valued integrable potential are studied. This work is aimed at finding the conditions under which the root function system forms a common Riesz basis rather than a Riesz basis with parentheses.
Keywords: Dirac operator, spectral expansion, regular boundary conditions. 
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A. S. Makin. Regular boundary value problems for the Dirac operator. Doklady Rossijskoj akademii nauk. Matematika, informatika, processy upravleniâ, Tome 492 (2020), pp. 49-53. http://geodesic.mathdoc.fr/item/DANMA_2020_492_a9/

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