On Some Formulas for the Lauricella Function

Ainur Ryskan () and Tuhtasin Ergashev ()
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Ainur Ryskan: Institute of Mathematics, Physics and Informatics, Abai Kazakh National Pedagogical University, 86 Tole Bi Street, Almaty 050012, Kazakhstan
Tuhtasin Ergashev: Department of Higher Mathematics, National Research University “TIIAME”, 39 Kari-Niyazi Street, Tashkent 100000, Uzbekistan

Mathematics, 2023, vol. 11, issue 24, 1-10

Abstract: Lauricella, G. in 1893 defined four multidimensional hypergeometric functions F A , F B , F C and F D . These functions depended on three variables but were later generalized to many variables. Lauricella’s functions are infinite sums of products of variables and corresponding parameters, each of them has its own parameters. In the present work for Lauricella’s function F A ( n ) , the limit formulas are established, some expansion formulas are obtained that are used to write recurrence relations, and new integral representations and a number of differentiation formulas are obtained that are used to obtain the finite and infinite sums. In the presentation and proof of the obtained formulas, already known expansions and integral representations of the considered F A ( n ) function, definitions of gamma and beta functions, and the Gaussian hypergeometric function of one variable are used.

Keywords: Appell functions; Lauricella functions; expansion formulas; integral representation; differentiation formulas; summation formulas (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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