We are interested in regular solutions to the first boundary value problem for a three-dimensional elliptic type equation with three singular coefficients and negative parameters in a rectangular parallelepiped. To study the problem, we use methods of spectral analysis. The solution is constructed in the form of the double Fourier–Bessel series.
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Urinov, A.K., Karimov, K.T. The Dirichlet Problem for an Elliptic Equation with Three Singular Coefficients and Negative Parameters. J Math Sci 274, 285–300 (2023). https://doi.org/10.1007/s10958-023-06596-7
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DOI: https://doi.org/10.1007/s10958-023-06596-7