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Rational Gauss-Chebyshev quadrature formulas for complex poles outside $ [-1,1]$
Authors:Karl Deckers  Joris Van Deun  Adhemar Bultheel
Institution:Department of Computer Science, K. U. Leuven, B-3001 Heverlee, Belgium ; Department of Computer Science, K. U. Leuven, B-3001 Heverlee, Belgium ; Department of Computer Science, K. U. Leuven, B-3001 Heverlee, Belgium
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]$.

Keywords:Quadrature formulas  orthogonal rational functions
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