Heckman–Opdam polynomials

In mathematics, Heckman–Opdam polynomials (sometimes called Jacobi polynomials) P_λ(k) are orthogonal polynomials in several variables associated to root systems. They were introduced by Heckman and Opdam (1987).

They generalize Jack polynomials when the roots system is of type A, and are limits of Macdonald polynomials P_λ(q, t) as q tends to 1 and (1 − t)/(1 − q) tends to k. Main properties of the Heckman–Opdam polynomials have been detailed by Siddhartha Sahi ^[1]