Orthogonal Rational Functions

Orthogonal Rational Functions

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This book generalises the classical theory of orthogonal polynomials on the complex unit circle, or on the real line to orthogonal rational functions whose poles are among a prescribed set of complex numbers. The first part treats the case where these poles are all outside the unit disk or in the lower half plane. Classical topics such as recurrence relations, numerical quadrature, interpolation properties, Favard theorems, convergence, asymptotics, and moment problems are generalised and treated in detail. The same topics are discussed for the different situation where the poles are located on the unit circle or on the extended real line. In the last chapter, several applications are mentioned including linear prediction, Pisarenko modelling, lossless inverse scattering, and network synthesis. This theory has many applications in theoretical real and complex analysis, approximation theory, numerical analysis, system theory, and in electrical engineering.Thus given some finite positive measure /, t (with possibly complex support), one considers the Hilbert space L2 (/t) of square integrable functions that ... Polynomials can be seen as rational functions Whose poles are all fixed at infinity . For theanbsp;...

Title:Orthogonal Rational Functions
Author:Adhemar Bultheel
Publisher:Cambridge University Press - 1999-02-13


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