Geodesic
Stability of basis property of a type of problems on eigenvalues with nonlocal perturbation of boundary conditions
Ufa mathematical journal, Tome 3 (2011) no. 2, pp. 27-32 Cet article a éte moissonné depuis la source Math-Net.Ru

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The article is devoted to a spectral problem for a multiple differentiation operator with an integral perturbation of boundary conditions of one type which are regular, but not strongly regular. The unperturbed problem has an asymptotically simple spectrum, and its system of normalized eigenfunctions creates the Riesz basis. We construct the characteristic determinant of the spectral problem with an integral perturbation of the boundary conditions. The perturbed problem can have any finite number of multiple eigenvalues. Therefore, its root subspaces consist of its eigen and (maybe) adjoint functions. It is shown that the Riesz basis property of a system of eigen and adjoint functions is stable with respect to integral perturbations of the boundary condition.
Keywords: Riesz basis, regular boundary conditions, eigenvalues, root functions, spectral problem, integral perturbation of boundary condition, characteristic determinant. 
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N. S. Imanbaev; M. A. Sadybekov. Stability of basis property of a type of problems on eigenvalues with nonlocal perturbation of boundary conditions. Ufa mathematical journal, Tome 3 (2011) no. 2, pp. 27-32. http://geodesic.mathdoc.fr/item/UFA_2011_3_2_a3/

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