Rational Gauss-Chebyshev quadrature formulas for complex poles outside $[-1,1]$

Abstract:

In this paper we provide an extension of the Chebyshev orthogonal rational functions with arbitrary real poles outside $[-1,1]$ to arbitrary complex poles outside $[-1,1]$. The zeros of these orthogonal rational functions are not necessarily real anymore. By using the related para-orthogonal functions, however, we obtain an expression for the nodes and weights for rational Gauss-Chebyshev quadrature formulas integrating exactly in spaces of rational functions with arbitrary complex poles outside $[-1,1]$.