More properties of $(\beta ,\gamma )$-Chebyshev functions and points

Abstract

Recently, $(\beta ,\gamma )$-Chebyshev functions, as well as the corresponding zeros, have been introduced as a generalization of classical Chebyshev polynomials of the first kind and related roots. They consist of a family of orthogonal functions on a subset of $[-1,1]$, which indeed satisfies a three-term recurrence formula. In this paper we present further properties, which are proven to comply with various results about classical orthogonal polynomials. In addition, we prove a conjecture concerning the Lebesgue constant's behavior related to the roots of $(\beta ,\gamma )$-Chebyshev functions in the corresponding orthogonality interval.