Written by a distinguished specialist in functional analysis, this book presents a comprehensive treatment of the history of Banach spaces and (abstract bounded) linear operators. Banach space theory is presented as a part of a broad mathematics context, using tools from such areas as set theory, topology, algebra, combinatorics, probability theory, logic, etc. Equal emphasis is given to both spaces and operators. The book may serve as a reference for researchers and as an introduction for graduate students who want to learn Banach space theory with some historical flavor.

VI closely related to finite dimensional locally convex spaces than are normed spaces. In order to present a clear narrative I have omitted exact references to the literature for individual propositions. However, each chapter begins with a short introduction which also contains historical remarks. Deutsche Akademie der vVissenschaften zu Berlin Institut fur Reine Mathematik Albrecht Pietsch Foreword to the Second Edition Since the appearance of the first edition, some important advances have taken place in the theory of nuclear locally convex spaces. Firsts there is the Universality Theorem ofT. and Y. Komura which fully confirms a conjecture of Grothendieck. Also, of particular interest are some new existence theorems for bases in special nuclear locally convex spaces. Recently many authors have dealt with nuclear spaces of functions and distributions. Moreover, further classes of operators have been found which take the place of nuclear or absolutely summing operators in the theory of nuclear locally convex spaces. Unfortunately, there seem to be no new results on diametrai or approximative dimension and isomorphism of nuclear locally convex spaces. Since major changes have not been absolutely necessary I have restricted myself to minor additions. Only the tenth chapter has been substantially altered. Since the universality results no longer depend on the existence of a basis it was necessary to introduce an independent eleventh chapter on universal nuclear locally convex spaces. In the same chapter s-nuclear locally convex spaces are also briefly treated.

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.

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.

Ich hatte es oft schmerzlich empfunden, daB bei der Schnelligkeit der Entwicklung unserer Wissenschaft die Zeit vOliiber ist, wo wir die gr6Bte Weisheit in den iiltesten Biichern fanden und so das Gliick genieBen konnten, das BewuBtsein der Belehrung mit dem Gefiihl der Pietat fiir das Ehrwiirdige zu verbinden. ERHARD SCHMIDT, 1919 Dieser Band des "TEUBNER-ARCHIVs zur Mathematik" enthalt die entscheiden- den Arbeiten uber "Lineare Integralgleichungen und Gleichungen mit unendlich vielen Unbekannten", die DAVID HILBERT und sein Schuler ERHARD SCHMIDT in der Zeit von 1904 bis 1910 publiziert haben. HILBERTS Mitteilungen "Grundzuge einer allgemeinen Theorie der linearen Integralgleichungen" sind in seinen "Gesammelten Abhandlun- gen" nicht enthalten, weil sie 1912 bei B. G. TEUBNER in Buchform erschienen (vgl. Foto S. 278); im vorliegenden Band findet der Leser fotomechanische Nachdrucke der G6ttinger Erstver6ffentlichungen. AuBerdem wird diese Edition auch deshalb von Interesse sein, weil "Gesammelte Abhandlungen" von ERHARD SCHMIDT bisher nicht vorliegen. Fur die Erteilung der Abdruckgenehmigungen sei der Akademie der Wissenschaften zu G6ttingen und der Redaktion der Rendicondi del Circolo Matematico di Palermo gedankt.