Orthonormal Systems and Banach Space Geometry

This book describes the interplay between orthonormal expansions and Banach space geometry.

Orthonormal Systems and Banach Space Geometry describes the interplay between orthonormal expansions and Banach space geometry. Using harmonic analysis as a starting platform, classical inequalities and special functions are used to study orthonormal systems leading to an understanding of the advantages of systems consisting of characters on compact Abelian groups. Probabilistic concepts such as random variables and martingales are employed and Ramsey's theorem is used to study the theory of super-reflexivity. The text yields a detailed insight into concepts including type and co-type of Banach spaces, B-convexity, super-reflexivity, the vector-valued Fourier transform, the vector-valued Hilbert transform and the unconditionality property for martingale differences (UMD). A long list of unsolved problems is included as a starting point for research. This book should be accessible to graduate students and researchers with some basic knowledge of Banach space theory, real analysis, probability and algebra.

Preface; Introduction; Preliminaries; 1. Ideal norms and operator ideals; 2. Ideal norms associated with matrices; 3. Ideal norms associated with orthonormal systems; 4. Rademacher and Gauss ideal norms; 5. Trigonometric ideal norms; 6. Walsh ideal norms; 7. Haar ideal norms; 8. Unconditionality; 9. Miscellaneous; Summaries; List of symbols; Bibliography; Index.

Orthonormal Systems and Banach Space Geometry describes the interplay between orthonormal expansions and Banach space geometry and yields a detailed insight into type and co-type of Banach spaces, B-convexity, super-reflexivity, the vector-valued Fourier transform, the vector-valued Hilbert transform and the unconditionality property for martingale differences (UMD).