On the basis property of root functions of a periodic problem with an integral perturbation of the boundary condition

Sturm-Liouville theory (34B24) Eigenfunctions, eigenfunction expansions, completeness of eigenfunctions of ordinary differential operators (34L10) Nonlocal and multipoint boundary value problems for ordinary differential equations (34B10)

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On stability of basis property of root vectors system of the Sturm-Liouville operator with an integral perturbation of conditions in nonstrongly regular Samarskii-Ionkin type problems ⋮ On the symmetry of the boundary conditions of the volume potential ⋮ Regular boundary value problems for the heat equation with scalar parameters ⋮ About characteristic determinant of one boundary value problem not having the basis property ⋮ A regular differential operator with perturbed boundary condition ⋮ On basic properties of eigenfunctions and associated functions of one loaded operator of multiple differentiation ⋮ About characteristic determinant of one boundary value problem not having the basis property ⋮ Nonlocal perturbation of a periodic problem for a second-order differential operator ⋮ On a Problem that Does not Have Basis Property of Root Vectors, Associated with a Perturbed Regular Operator of Multiple Differentiation ⋮ Differential operator equations with interface conditions in modified direct sum spaces ⋮ Equiconvergence property for spectral expansions related to perturbations of the operator - u(-x) with initial data

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