Gegenbauer expansions and addition theorems for a binomial and logarithmic fundamental solution of the even-dimensional Euclidean polyharmonic equation

Published

August 4, 2022

Author(s)

Howard Cohl, James F. Lawrence, Lisa Ritter, Jessie Hirtenstein

Abstract

On even-dimensional Euclidean space for integer powers of the positive Laplace operator greater than or equal to half the dimension, a fundamental solution of the polyharmonic equation has binomial and logarithmic behavior. Gegenbauer polynomial expansions of these fundamental solutions are obtained through a limit applied to Gegenbauer expansions of a power-law fundamental solution of the polyharmonic equation. This limit is accomplished through parameter differentiation. By combining these results with previously derived azimuthal Fourier series expansions for these binomial and logarithmic fundamental solutions, we are able to obtain addition theorems for the azimuthal Fourier coefficients. These logarithmic and binomial addition theorems are expressed in Vilenkin polyspherical geodesic polar coordinate systems and as well in generalized Hopf coordinates on hyperspheres in arbitrary even dimensions.

Citation

Journal of Mathematical Analysis and Applications

Volume

517

Pub Type

Journals

Download Paper

https://doi.org/10.1016/j.jmaa.2022.126576

Local Download

Keywords

logarithmic fundamental solutions, even dimensional Cartesian space, Gegenbauer polynomial expansions

Citation

Cohl, H. , Lawrence, J. , Ritter, L. and Hirtenstein, J. (2022), Gegenbauer expansions and addition theorems for a binomial and logarithmic fundamental solution of the even-dimensional Euclidean polyharmonic equation, Journal of Mathematical Analysis and Applications, [online], https://doi.org/10.1016/j.jmaa.2022.126576, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=933981 (Accessed October 14, 2025)