Abstract Analytic Function Theory and Hardy Algebras

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593 IIIIII IIIIIIIIIIIII

Klaus Barbey Heinz KSnig

Abstract Analytic Function Theory and Hardy Algebras III II

I IIIII III Inllll

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Springer-Verlag Berlin-Heidelberq • New York 1977

II

II III I

Authors Klaus Barbey Fachbereich Mathematik UniversitAt Regensburg U niversit~tsstraBe 31 8400 Regensburg/BRD Heinz K6nig Fachbereich Mathematik Universit~t des Saarlandes 6 6 0 0 SaarbdJcken/BRD

AMS Subject Classifications (1970): 46J 10, 46J 15 ISBN 3-540-08252-2 Springer-Verlag Berlin • Heidelberg • New York ISBN 0-38?-08252-2 Springer-Verlag New York • Heidelberg • Berlin This work is subiect to copyright. All rights are reserved, whether 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 § 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. © by Springer-Verlag Berlin • Heidelberg 1977 Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2141/3140-543210

Preface

The p r e s e n t work w a n t s tional-analytic

theory.

classical analytic

It is an a b s t r a c t v e r s i o n of those parts of

f u n c t i o n t h e o r y w h i c h can be c i r c u m s c r i b e d by b o u n d a r y

v a l u e t h e o r y and Hardy the

to be the s y s t e m a t i c p r e s e n t a t i o n of a func-

spaces H p. The f a s c i n a t i o n of the field comes from

fact that famous c l a s s i c a l

theorems

of t y p i c a l

vor a p p e a r as i n s t a n t o u t f l o w s of an a b s t r a c t are s t a n d a r d r e a l - a n a l y t i c m e t h o d s and m e a s u r e

theory.

such as e l e m e n t a r y

in papers of Arens

and Singer,

and went t h r o u g h

c h l e t algebras, and i l l u m i n a t e

Gleason,

functional analysis

H e l s o n and L o w d e n s l a g e r ,

several steps of a b s t r a c t i o n

logmodular algebras,...). the c o n c r e t e c l a s s i c a l

concept

theory.

We p r e s e n t

the u l t i m a t e

is the a b s t r a c t Hardy a l g e b r a situation.

IV-IX.

It is

to b u i l d up a cohe-

rent t h e o r y of r e m a r k a b l e and p l e a s a n t w i d t h and depth. in C h a p t e r s

(Diri-

for about ten years.

c o m p r e h e n s i v e as w e l l as pure a n d s i m p l e and p e r m i t s present a systematic account

Bochner,

It never c e a s e d to r a d i a t e back

step of a b s t r a c t i o n w h i c h has b e e n u n d e r w o r k The c e n t r a l

fla-

The a b s t r a c t t h e o r y s t a r t e d a b o u t t w e n t y y e a r s ago

Bishop,

Wermer,...

complex-analytic

theory the tools of w h i c h

We a t t e m p t

to

The a b s t r a c t Hardy alge-

bra s i t u a t i o n can be looked upon as a local s e c t i o n of the a b s t r a c t function a l g e b r a situation.

To a c h i e v e the l o c a l i z a t i o n is the m