If Vn and Yn are monic polynomials of degree n with Vn(0) ≠ 0 and Yn(0) ≠ 0 such that $\left\{ {{V_n}\left( z \right),{z^{ - n - 1}}{Y_n}\left( z \right)} \right\}_{n = 0}^\infty $ is a biorthogonal ...