A common zero at the end point of the support of measure for the quasi-natured spectrally transformed polynomials

Vikash Kumar, A. Swaminathan

Published 2024-05-20Version 1

In this work, the explicit expressions of coefficients involved in quasi-type kernel polynomials of order one and quasi-Geronimus polynomials of order one are determined for Jacobi polynomials. These coefficients are responsible for establishing the orthogonality of quasi-spectral polynomials for Jacobi polynomials. Additionally, the orthogonality of quasi-type kernel Laguerre polynomials of order one is derived. In the process of achieving orthogonality, one zero in both cases is located on the boundary of the support of the measure. This allows us to derive the chain sequence and minimal parameter sequence at the point lying at the end point of the support of the measure. Also, this leads to the question of characterizing such spectrally transformed polynomials. Furthermore, the interlacing properties among the zeros of quasi-spectral orthogonal Jacobi polynomials and Jacobi polynomials are illustrated.