Discrepancy of Signed Measures and Polynomial Apporoximation

Springer Monographs in Mathematics

Erschienen am 14.12.2001
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ISBN/EAN: 9780387986524
Sprache: Englisch
Umfang: xiv, 438 S., 1 s/w Illustr., 36 s/w Zeichng.
Einband: gebundenes Buch

Beschreibung

The book is an authoritative and up-to-date introduction to the field of Analysis and Potential Theory dealing with the distribution zeros of classical systems of polynomials such as orthogonal polynomials, Chebyshev, Fekete and Bieberbach polynomials, best or near-best approximating polynomials on compact sets and on the real line. The main feature of the book is the combination of potential theory with conformal invariants, such as module of a family of curves and harmonic measure, to derive discrepancy estimates for signed measures if bounds for their logarithmic potentials or energy integrals are known a priori. Classical results of Jentzsch and Szegö for the zero distribution of partial sums of power series can be recovered and sharpened by new discrepany estimates, as well as distribution results of Erdös and Turn for zeros of polynomials bounded on compact sets in the complex plane. Vladimir V. Andrievskii is Assistant Professor of Mathematics at Kent State University. Hans-Peter Blatt is Full Professor of Mathematics at Katholische Universität Eichstätt.

Inhalt

* Preface * Auxiliary Facts * Zero Distribution of Polynomials * Discrepancy Theorems via Two-Sided Bounds for Potentials * Discrepancy Thoerems via One-Sided Bounds for Potentials * Discrepancy Theorems via Energy Integrals * Applications of Jentzsch-Szegö and Erdös-Turan Type Theorems * Applications of Discrepancy Theorems * Special Topics * Appendix A: Conformally INvariant Characteristics of Curve Families * Appendix B: Basics in the Theory of Quasiconformal Mappings * Appendix C: Constructive Theory of Functions of a Complex Variable * Appendix D: Miscellaneous Topics * Bibliography * Glossary of Notation * Index *

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