An Introduction to Non-Harmonic Fourier Series, Revised Edition, 93 / Edition 2

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Overview

The theory of nonharmonic Fourier series is concerned with the completeness and expansion properties of sets of complex exponential functions. Its origins, which are classical in spirit, lie in the celebrated works of Paley and Wiener (Fourier Transforms in the Complex Domain) and Levinson (Gap and Density Theorems).

This book is an account of both the classical and modern theories and its underlying theme is the elegant interplay among the various parts of analysis. Designed primarily for the graduate student or mathematician who is approaching the subject for the first time, its aim is to provide a unified and self-contained introduction to a rich and multifaceted field, not an exhaustive account of all that is known.

The new edition brings the original work up to date.

Audience: Junior and senior undergraduate and first-year graduate students in mathematics.

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Editorial Reviews

From the Publisher
From Book News, Inc.
The theory of nonharmonic Fourier series is concerned with the completeness and expansion properties of sets of complex exponential functions. This text for graduate students and mathematicians provides an introduction to some of the classical and modern theories within this broad field. Young (mathematics, Oberlin College) discusses such topics as the stability of bases in Banach spaces, estimates for canonical products, and moment sequences in Hilbert space.Book News, Inc.®, Portland, OR
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Product Details

  • ISBN-13: 9780127729558
  • Publisher: Elsevier Science
  • Publication date: 5/1/2001
  • Edition description: Revised
  • Edition number: 2
  • Pages: 234
  • Product dimensions: 0.69 (w) x 6.00 (h) x 9.00 (d)

Meet the Author

Robert Young was born in New York City in 1944. He received his B.A. from Colby College in 1965 and his Ph.D. from the University of Michigan in 1971. He currently teaches at Oberlin College where he holds the James F. Clark Chair in Mathematics. In addition to his work in nonharmonic Fourier series, he is the author of Excursions in Calculus: An Interplay of the Continuous and the Discrete.
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Table of Contents

Bases in Banach Spaces - Schauder Bases; Schauder's Basis for C[a,b]; Orthonormal Bases in Hilbert Space; The Reproducing Kernel; Complete Sequences;
The Coefficient Functionals; Duality; Riesz Bases;
The Stability of Bases in Banach Spaces; The Stability of Orthonormal Bases in Hilbert Space

Entire Functions of Exponential Type

The Classical Factorization Theorems - Weierstrass's Factorization Theorem; Jensen's Formula; Functions of Finite Order; Estimates for Canonical Products; Hadamard's Factorization Theorem

Restrictions Along a Line - The "Phragmen-Lindelof" Method; Carleman's Formula; Integrability on a line; The Paley-Wiener Theorem; The Paley-Wiener Space

The Completeness of Sets of Complex Exponentials -
The Trigonometric System; Exponentials Close to the Trigonometric System; A Counterexample; Some Intrinsic Properties of Sets of Complex Exponentials
Stability; Density and the Completeness Radius

Interpolation and Bases in Hilbert Space - Moment Sequences in Hilbert Space; Bessel Sequences and Riesz-Fischer Sequences; Applications to Systems of Complex Exponentials; The Moment Space and Its Relation to Equivalent Sequences; Interpolation in the Paley-Wiener Space: Functions of Sine Type; Interpolation in the Paley-Wiener Space: Stability;
The Theory of Frames; The Stability of Nonharmonic Fourier Series; Pointwise Convergence; Notes and Comments; References; List of Special Symbols
Index

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