Infinite Matrices of Operators

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786 Ivor J. Maddox

Infinite Matrices of Operators

Springer-Verlag Berlin Heidelberg New York 1980

Author Ivor J. Maddox Department of Pure Mathematics Queen's University Belfast BT7 1NN United Kingdom

AMS Subject Classifications (1980): 40-02, 40 C 0 5 , 40 E05, 40 F 05, 4 0 G 0 5 , 4 0 H 0 5 , 46-02 ISBN 3-540-09?64-3 Springer-Verlag Berlin Heidelberg NewYork ISBN 0-387-09?64-3 Springer-Verlag NewYork Heidelberg Berlin Library of Congress Cataloging in PublicationData.Maddox,Ivor John. Infinite matrices of operators.(Lecture notes in mathematics; 786) Bibliography:p. Includes index. 1. Operator theory. 2. Matrices, Infinite. 3. Summabilitytheory. I. Title. I1. Series: Lecture notes in mathematics(Berlin) ; 786. QA3.L28 no. 786 [QA329] 510s [515.?'24] 80-11702 This work is subject 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 1980 Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2141/3140-543210

CONTENTS i.

Introduction General remarks Dual sequence spaces

2.

Notation and terminology

3

Standard sequence spaces

3

Group norms

5

Generalized K~the-Toeplitz Theorems of Kojima-Schur,

3.

duals; matrix classes Toeplitz,

8 10

Schur

T h e o r e m of Crone

15

Strong summability

17

Abel, Ces~ro, N ~ r l u n d surmnability

18

Generalized K~the-Toeplitz

19

duals

19

cB(X) o

cB(x)

20

g~ (x)

21

c a (x) o

23

£1(B(X,y))

24

c £~(X)

~B(X), O < p -< 1 P

26

£~(X), 1 < p < P

27

~(X),

29

P

1 < p