Geometry of Banach Spaces-Selected Topics

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485 III

Im

Joseph Diestel

Geometry of Banach Spaces Selected Topics

Springer-Verlag 9 York 1975 Berlin. Heidelberg New

Author Prof. Joseph Diestel Department of Mathematics Kent State University Kent, Ohio 44242 USA

Library of Congress Cataloging in Publication Data

Diestel, Joseph, 19~BGeometry of Banach spaces. (Lecture notes in mathematics ; 485) Bibliography: p. Includes index. 1. Banach spaces. 2. Vector-valued measures. I. Title. II. Series: Lecture notes in mathematics

(Berlin) ; /+85.

QA3.L28 no. 485

EQA322.2]

510'.8s c515w.73~

75-26821

AMS Subject Classifications (1970): 28A45, 46 B10, 46 B99 ISBN 3-540-07402-3 Springer-Verlag Berlin Heidelberg 9 New 9 York ISBN 0-387-0?402-3 Springer-Verlag New York Heidelberg 9 Berlin 9 This work is subject to copyright. All rights are reserved, wh~ther the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. Under w 54 of the German Copyright Law where copies are made for other than private use, a fee is payable to the publisher, the amount of the fee to be determined by agreement with the publisher. 9 by Springer-Verlag Berlin 9Heidelberg1975 Printed in Germany Offsetdruck: Julius Beltz, Hemsbach/Bergstr.

Preface

These notes were the subject of lectures given at Kent State University during the 1973-74 academic year. the geometry of Banach spaces

At that time, it was already clear that

(in the form of convexity and smoothness

type

considerations)

would play a central role in the theory of Radon-Nikodym

differentiation

for vector-valued

course:

to acquaint my students

the geometry of Banach spaces.

measures.

This was the object of the

(and, to a large extent, myself) with Naturally,

the logical

courses was a discussion of the Radon-Nikodgm

finish to the

theorem viewed

from a

pure%y geometric perspective. Some words about the organization

of the notes.

The first chapter deals with the plenitude of support functionals closed bounded convex subsets of a Banaeh space. the Bishop-Phelps weak compactness. modern functional

subreflexivity

Two results are focal:

theorem and James' characterization

of

I feel that these are among the deepest results of analysis and have tried throughout

them whenever possible.

When the Deity allowed

be proved, He meant for them to be usedl application

to operators attaining

topological

tensor products

concerning prerequisites a one-time affair.

to

the notes to apply

for theorems like these to

This chapter is closed with an

their norm which uses the theory to

for its proof;

this is the only excursion

outside of elementary

functional

analysis and is

The principle purpose here is to highlight

restriction placed upon a Banach space

the severe

(or pair of Banach spaces)

operator attain its norm; it also is an interesting

that every

application of James'

theorem. Chapter Two deals with the basics of convexity and smoothness. prov