A series solution of the general Heun equation in terms of incomplete Beta functions

zbMATH Open1315.33026arXiv1405.5959MaRDI QIDQ5250211

Ashot M. Manukyan, A. M. Ishkhanyan, T. A. Ishkhanyan, M. V. Hakobyan

Publication date: 18 May 2015

Abstract: We show that in the particular case when a characteristic exponent of the singularity at infinity is zero the solution of the general Heun equation can be expanded in terms of the incomplete Beta functions. By means of termination of the series, closed-form solutions are derived for two infinite sets of the involved parameters. These finite-sum solutions are written in terms of elementary functions that in general are quasi-polynomials. The coefficients of the expansion obey a three-term recurrence relation, which in some particular cases may become two-term. We discuss the case when the recurrence relation involves two non-successive terms and show that the coefficients of the expansion are then calculated explicitly and the general solution of the Heun equation is constructed as a combination of several hypergeometric functions with quasi-polynomial pre-factors.

Full work available at URL: https://arxiv.org/abs/1405.5959

zbMATH Keywords

recurrence relations special functions series expansions Heun equation linear ordinary differential equation

Mathematics Subject Classification ID

Other functions coming from differential, difference and integral equations (33E30) Special ordinary differential equations (Mathieu, Hill, Bessel, etc.) (34B30) Random power series in one complex variable (30B20)