Properties in L p of root functions for a nonlocal problem with involution

Kritskov, L. V.; Sadybekov, Makhmud A.; Sarsenbi, A. M.

doi:10.3906/mat-1809-12

Cited by 21 publications

(17 citation statements)

References 18 publications

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“…Spectral problems related to our topic were considered in the works [27][28][29][30][31][32]. In [27] a problem with the nonlocal conditions y(-1) = 0, y (-1) = y (1)…”

Section: Spectral Problemmentioning

confidence: 99%

Direct and inverse problems for nonlocal heat equation with boundary conditions of periodic type

2022

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A mathematical model of the process of heat diffusion in a closed metal wire is considered. This wire is wrapped around a thin sheet of insulation material. We assume that the insulation is slightly permeable. Because of this, the temperature at the point of the wire on one side of the insulation influences the diffusion process in the wire on the other side of the insulation. Thus, the standard heat equation will change and an extra term with involution will be added. When modeling of this process there arises an initial-boundary value problem for a one-dimensional heat equation with involution and with a boundary condition of periodic type with respect to a spatial variable. We prove the well-posedness of the formulated problem in the class of strong generalized solutions. The use of the method of separation of variables leads to a spectral problem for an ordinary differential operator with involution at the highest derivative. All eigenfunctions of the problem are constructed. In the case when all eigenvalues of the problem are simple, the system of eigenfunctions does not form an unconditional basis. A criterion when this spectral problem can have an infinite number of multiple eigenvalues is proved. Corresponding root subspaces consist of one eigenfunction and one associated function. We prove that the system of root functions forms an unconditional basis and can be used for constructing a solution of the heat conduction problem by the method of separation of variables. We also consider an inverse problem. This is the problem on restoring (simultaneously with solving) of an unknown stationary source of external influence with respect to an additionally known final state. The existence of a unique solution of this inverse problem and its stability with respect to initial and final data are proved.

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“…Spectral problems related to our topic were considered in the works [27][28][29][30][31][32]. In [27] a problem with the nonlocal conditions y(-1) = 0, y (-1) = y (1)…”

Section: Spectral Problemmentioning

confidence: 99%

Direct and inverse problems for nonlocal heat equation with boundary conditions of periodic type

2022

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“…There is also a number of studies devoted to the first-order (see [8][9][10][11][12][13][14][15]) and second-order FDO with involution (see [16][17][18][19][20][21][22]). The majority of results of the mentioned papers are concerned with the basis property of eigenfunctions, eigenvalue asymptotics, and other issues of direct spectral theory.…”

Section: 1)mentioning

confidence: 99%

Inverse spectral problems for functional-differential operators with involution

Bondarenko¹

2021

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The main goal of this paper is to propose an approach to inverse spectral problems for functional-differential operators (FDO) with involution. For definiteness, we focus on the second-order FDO with involution-reflection. Our approach is based on the reduction of the problem to the matrix form and on the solution of the inverse problem for the matrix Sturm-Liouville operator by developing the method of spectral mappings. The obtained matrix Sturm-Liouville operator contains the weight, which causes qualitative difficulties in the study of the inverse problem. As a result, we show that the considered FDO with involution is uniquely specified by five spectra of certain regular boundary value problems.

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“…The monographs of D. Przeworska-Rolewicz [3] and J. Wiener [4] are devoted to the theory of solvability of various differential equations with involution. In papers [5][6][7][8][9][10][11][12][13][14], spectral problems for differential operators of the first and second orders with involution were studied. In [15][16][17][18][19][20][21][22], the results of studying spectral problems with involution are used to solve inverse problems.…”

Section: Introduction and The Problem Statementmentioning

confidence: 99%