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Description - General Orthogonal Polynomials by Herbert Stahl

In this treatise, the authors present the general theory of orthogonal polynomials on the complex plane and several of its applications. The assumptions on the measure of orthogonality are general, the only restriction is that it has compact support on the complex plane. In the development of the theory the main emphasis is on asymptotic behaviour and the distribution of zeros. In the first two chapters exact upper and lower bounds are given for the orthonormal polynomials and for the location of their zeros. The next three chapters deal with regular n-th root asymptotic behaviour, which plays a key role both in the theory and in its applications. Orthogonal polynomials with this behaviour correspond to classical orthogonal polynomials in the general case, and many extremal properties of measures in mathematical analysis and approximation theory with this type of regularity turn out to be equivalent. Several easy-to-use criteria are presented for regular behaviour. The last chapter contains applications of the theory, including exact rates for convergence of rational interpolants, best rational approximants and non-diagonal Pade approximants to Markov functions (Cauchy transforms of measures). The results are based on potential theoretic methods, so both the methods and the results can be extended to extremal polynomials in norms other than L2 norms. A sketch of the theory of logarithmic potentials is given in an appendix.

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Book Details

ISBN: 9780521415347
ISBN-10: 0521415349
Format: Hardback
(234mm x 156mm x 19mm)
Pages: 268
Imprint: Cambridge University Press
Publisher: Cambridge University Press
Publish Date: 24-Apr-1992
Country of Publication: United Kingdom

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General Orthogonal Polynomials by Herbert Stahl
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