Robuta

https://iris.uninettunouniversity.net/handle/20.500.14086/1683 Generalization of two-variable Chebyshev and Gegenbauer polynomials gegenbauer polynomials generalization two variable chebyshev https://functions.wolfram.com/Polynomials/GegenbauerC3/06/01/05/01/ShowAll.html Gegenbauer polynomials: Series representations (subsection 06/01/05/01) For the function itself (6 formulas) gegenbauer polynomials series representations subsection https://functions.wolfram.com/Polynomials/GegenbauerC3/04/01/0001/ Gegenbauer polynomials: General characteristics (formula 05.09.04.0001) General characteristics gegenbauer polynomials general characteristics formula