| Abstrakt: |
In this paper, we consider perturbations of a second-order differential equation for a spectral problem with a loaded term containing a value of derivative of the desired function at the zero point, with regular, but not strongly regular, boundary value conditions. A characteristic determinant of the considered spectral problem is constructed. Question on stability and instability of basis property of systems of root functions of a loaded second-order differential operator is investigated. [ABSTRACT FROM AUTHOR] |
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