“…, n − 1, X n , 1 = 0, X n , z n = 0, which are termed as deficiency in the orthogonality of these para-orthogonal polynomials. In recent years, these para-orthogonal polynomials have been linked to kernel polynomials K n (z, ω), see [6,11,27]. The kernel polynomials K n (z, ω) satisfy the Christoffel-Darboux formula…”