Copyright © 2010 Eugenia N. Petropoulou. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The complex zeros of the orthogonal Laguerre polynomials Ln(a)(x) for a<-n, ultraspherical polynomials Pn(λ)(x) for λ<-n, Jacobi polynomials Pn(a,β)(x) for a<-n, β<-n, a+β<-2(n+1), orthonormal Al-Salam-Carlitz II polynomials Pn(a)(x;q) for a<0, 0<q<1, and q-Laguerre polynomials Ln(a)(x;q) for a<-n, 0<q<1 are studied. Several inequalities regarding the real and imaginary properties of these zeros are given, which help locating their position. Moreover, a few limit relations regarding the asymptotic behavior of these zeros are proved. The method used is a functional analytic one. The obtained results complement and improve previously known results.