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Nonlocal problem for a three-dimensional elliptic equation with singular coefficients in a rectangular parallelepiped

Kamoliddin T. Karimov

Ferghana State University, Ferghana, Uzbekistan

Abstract: The nonlocal problem for an elliptic equation with two singular coefficients in a rectangular parallelepiped is studied. The uniqueness of the solution of the problem is proved with the use of the method of energy integrals. The spectral Fourier method based on the separation of variables is used to prove the existence of solutions. The solution of the problem is constructed as double Fourier series in terms of a sum of trigonometric and Bessel functions. Under some conditions on parameters and given functions the uniform convergence of the constructed series and its derivatives up to the second order inclusive is proved.

Keywords: elliptic type equation, nonlocal problem, singular coefficient, spectral method, parallelepiped.

UDC: 517.956.223

Received: 20.05.2020
Received in revised form: 14.06.2020
Accepted: 08.07.2020

Language: English

DOI: 10.17516/1997-1397-2020-13-5-533-546

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