A Double Chebyshev Series: Derivation And Evaluation

TL;DR

This paper derives a generalized double Chebyshev series generating function using contour integrals, offering a closed-form solution that simplifies computation and has potential applications in solving partial differential equations.

Contribution

It introduces a new generalized double Chebyshev series generating function derived via contour integrals, with a closed-form expression simplifying previous numerical approaches.

Findings

Derived a new generating function involving Chebyshev polynomials

Provided a closed-form solution for the generating function

Discussed applications to partial differential equations

Abstract

In this paper we use a contour integral method to derive a generating function in the form of a double series involving the product of two Chebyshev polynomials over generalized independent indices expressed in terms of the incomplete gamma function. The generating function represents a more generalized form relative to current literature. A possible application of this function to solving partial differential equations is discussed and some special cases of this generating function are derived. The work involved in the computation of this generating function is easier relative to previous methods as we have a closed form solution as opposed to numerical methods.