Quadratic transformations for orthogonal polynomials in one and two variables

摘要

We discuss quadratic transformations for orthogonal polynomials in one andtwo variables. In the one-variable case we list many (or all) quadratictransformations between families in the Askey scheme or $q$-Askey scheme. Inthe two-variable case we focus, after some generalities, on the polynomialsassociated with root system $BC_2$, i.e., $BC_2$-type Jacobi polynomials if$q=1$ and Koornwinder polynomials in two variables in the $q$-case.