Iterative Methods for Fixed Point Problems in Hilbert Spaces
Iterative methods for finding fixed points of non-expansive operators in Hilbert spaces have been described in many publications. In this monograph we try to present the methods in a consolidated way. We introduce several classes of operators, examine the
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2057
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Andrzej Cegielski
Iterative Methods for Fixed Point Problems in Hilbert Spaces
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Andrzej Cegielski University of Zielona G´ora Faculty of Mathematics, Computer Science and Econometrics Zielona G´ora, Poland
ISBN 978-3-642-30900-7 ISBN 978-3-642-30901-4 (eBook) DOI 10.1007/978-3-642-30901-4 Springer Heidelberg New York Dordrecht London Lecture Notes in Mathematics ISSN print edition: 0075-8434 ISSN electronic edition: 1617-9692 Library of Congress Control Number: 2012945521 Mathematics Subject Classification (2010): 47-02, 49-02, 65-02, 90-02, 47H09, 47J25, 37C25, 65F10, 65K15, 90C25 c Springer-Verlag Berlin Heidelberg 2012 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher’s location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein. Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)
To my family: El˙zbieta, Joanna, Gustaw, Szymon and Katarzyna
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Motto: If you want to find the source, you have to go up, against the current [John Paul II]
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Preface
In this monograph we deal with iteration methods for finding fixed points (if they exist) of nonexpansive operators defined on a Hilbert space, i.e., operators T having the property d.T x; T y/ cd.x; y/ for all x; y 2 X (1) and for some constant c 2 Œ0; 1. The origin of these methods dates back to 1920, when Stefan Banach (1892–1945) formulated hi
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