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Archive of Issues

Uzbekistan Ferghana; Tashkent
Year
2022
Volume
32
Issue
2
Pages
240-255
 Section Mathematics Title On the solvability of nonlocal initial-boundary value problems for a partial differential equation of high even order Author(-s) Urinov A.K.ab, Azizov M.S.a Affiliations Ferghana State Universitya, Institute of Mathematics, National Academy of Sciences of Uzbekistanb Abstract In the present paper, two non-local initial-boundary value problems have been formulated for a partial differential equation of high even order with a Bessel operator in a rectangular domain. The correctness of one of the considered problems has been investigated. To do this, applying the method of separation of variables to the problem under consideration, the spectral problem was obtained for an ordinary differential equation of high even order. The self-adjointness of the last problem was proved, which implies the existence of the system of its eigenfunctions, as well as orthonormality and completeness of this system. Further, the Green's function of the spectral problem was constructed, with the help of which it was equivalently reduced to the Fredholm integral equation of the second kind with symmetrical kernel. Using this integral equation and Mercer's theorem, the uniform convergence of some bilinear series depending on found eigenfunctions has been studied. The order of the Fourier coefficients was established. The solution of the considered problem has been written as the sum of a Fourier series with respect to the system of eigenfunctions of the spectral problem. The uniform convergence of this series and also the series obtained from it by term-by-term differentiation was proved. Using the method of spectral analysis, the uniqueness of the solution of the problem was proved. An estimate for the solution of the problem was obtained, from which its continuous dependence on the given functions follows. Keywords differential equation of even order, nonlocal problem, Green's function, integral equation UDC 517.956 MSC 35G15 DOI 10.35634/vm220206 Received 1 March 2022 Language Russian Citation Urinov A.K., Azizov M.S. On the solvability of nonlocal initial-boundary value problems for a partial differential equation of high even order, Vestnik Udmurtskogo Universiteta. Matematika. Mekhanika. Komp'yuternye Nauki, 2022, vol. 32, issue 2, pp. 240-255. References Tikhonov A.N., Samarskii A.A. Uravneniya matematicheskoi fiziki (Equations of mathematical physics), Moscow: Nauka, 1977. Nakhushev A.M. Uravneniya matematicheskoi biologii (Equations of mathematical biology), Moscow: Vysshaya Shkola, 1995. Korenev B.G. Voprosy rascheta balok i plit na uprugom osnovanii (Issues of calculation of beams and slabs on an elastic foundation), Moscow: Stroiizdat, 1954. Makhover E.V. Bending of a plate of variable thickness with a sharp edge, Uch. zap. LGP im. 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