Two-variable Jacobi polynomials on the triangle are realized as representation overlaps of the rank two Jacobi algebra J_2, whose pentagonal subalgebra structure also yields Racah expansions under variable permutations.
Two-variable analogues of the classical orthogonal polynomials
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Algebraic interpretation of the two-variable Jacobi polynomials on the triangle: the pentagonal way
Two-variable Jacobi polynomials on the triangle are realized as representation overlaps of the rank two Jacobi algebra J_2, whose pentagonal subalgebra structure also yields Racah expansions under variable permutations.