In this one, I have cast off all restraint and gone all out to discuss many kinds of path integrals and their uses. The most important change concerns the inclusion of Chaper 21, "Path Integrals: Part II." The first edition already revealed my partiality for this subject by having a chapter devoted to it, which was quite unusual in those days. I don't know how it got left out the first time-I wish I could go back and change it. Next, I have added a discussion of time-reversal invariance. First, I have rewritten a big chunk of the mathematical introduction in Chapter 1. Apart from small improvements scattered over the text, there are three major changes. I welcome this opportunity to rectify all that. I was generally quite happy with the book, although there were portions where I felt I could have done better and portions which bothered me by their absence. This is based on the response of teachers, students, and my own occasional rereading of the book. 10013 All rights reserved No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording, or otherwise, without written permission from the Publisher Printed in the United States of America To My Parents and to Uma, Umesh, Ajeet, Meera, and Maya Preface to the Second Edition Over the decade and a half since I wrote the first edition, nothing has altered my belief in the soundness of the overall approach taken here. 94-26837 CIP ISBN 0-8 ©1994, 1980 Plenum Press, New York A Division of Plenum Publishing Corporation 233 Spring Street, New York, N.Y. Includes bibliographical references ISBN 0-8 I. NEW YORK AND LONDON Library of Congress Cataloging-in-Publication Data Shankar, Ramamurti.Shankar Yale University New Haven, Connecticut PLENUM PRESS Principles of Quantum Mechanics SECOND EDITION Principles of Quantum Mechanics SECOND EDITION R.
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