A Solution of a Boundary Value Problem with Mixed Conditions for a Four-Dimensional Degenerate Elliptic Equation

Zharasbek Baishemirov, Abdumauvlen Berdyshev and Ainur Ryskan
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Zharasbek Baishemirov: Institute of Mathematics, Physics and Informatics, Abai Kazakh National Pedagogical University, Tole bi Str., 86, Almaty 050012, Kazakhstan
Abdumauvlen Berdyshev: Institute of Mathematics, Physics and Informatics, Abai Kazakh National Pedagogical University, Tole bi Str., 86, Almaty 050012, Kazakhstan
Ainur Ryskan: Institute of Mathematics, Physics and Informatics, Abai Kazakh National Pedagogical University, Tole bi Str., 86, Almaty 050012, Kazakhstan

Mathematics, 2022, vol. 10, issue 7, 1-14

Abstract: The solvability issues of counterpart Holmgren’s boundary value problem with mixed conditions for a degenerate four-dimensional second-order Gellerstedt equation H u ≡ y m z k t l u x x + x n z k t l u y y + x n y m t l u z z + x n y m z k u t t = 0 , m , n , k , l ≡ c o n s t > 0 , are studied in the finite domain R 4 + , where the values of normal derivatives are set on the piecewise smooth part of the boundary and the values of the desired function are set on the remaining part of the boundary. The main results of the work are the proof of the uniqueness of the considered problem solution by using an energy integral’s method and the construction of the solution of counterpart Holmgren’s boundary value problem in explicit form by means of Green’s function method, containing the hypergeometric Lauricella’s function F A 4 . Using the corresponding fundamental solution for the considered generalized Gellerstedt equation of elliptic type, we construct Green’s function. In addition, formulas of differentiation, some adjacent relations, decomposition formulas, and various properties of Lauricella’s hypergeometric functions were used to establish the main results for the aforementioned problem.

Keywords: degenerate partial differential equation; counterpart Holmgren’s boundary value problem; fundamental solution; Lauricella’s hypergeometric function; Green’s function (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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