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**An initial boundary value problem for a partial differential equation of higher even order with a Bessel operator.**
*(Russian.
English summary)*
Zbl 1513.35127

Summary: In present paper, an initial-boundary value problem is formulated in a rectangle for a higher even order partial differential equation with the Bessel operator. Applying the method of separation of variables to the considered problem a spectral problem is obtained for an ordinary differential equation of higher even order. The self-adjointness of the last problem is proved, which implies the existence of the system of its eigenfunctions, as well as the orthonormality and completeness of this system. The uniform convergence of some bilinear series and the order of the Fourier coefficients, depending on the found eigenfunctions, is investigated. The solution of the considered problem is found as the sum of the Fourier series with respect to the system of eigenfunctions of the spectral problem. The absolute and uniform convergence of this series, as well as the series obtained by its differentiating, have been proved. The uniqueness of the solution of the problem is proved by the method of spectral analysis. An estimate is obtained for the solution of the problem which implies the continuous dependence of the solution on the given functions.

### MSC:

35G15 | Boundary value problems for linear higher-order PDEs |

### Keywords:

even order partial differential equation; Bessel operator; initial-boundary value problem; spectral method; Green’s function; integral equation; existence; uniqueness and stability of solution
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\textit{A. K. Urinov} and \textit{M. S. Azizov}, Vestn. Samar. Gos. Tekh. Univ., Ser. Fiz.-Mat. Nauki 26, No. 2, 273--292 (2022; Zbl 1513.35127)

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