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Ackno wledgmen ts I wish to acknowledge those people who directly or indirectly contributed to this book. I am indebted to R. M. Lauver for his continuous encourage ment to teach and to publish; to J. K. Wolf for his instruction and allow ing me to use his lecture notes which guided my presentation of material; to B. P. Bogert for his moral support during preparation of the final draft; and especially to G. H. Robertson for making available to me his reper toire of computer programs, which were extensively used for numerical computations; to J. D. Patterson for a critical reading of the final draft; to Miss N. Lockwood for faithfully typing many versions of the manuscript over a period of five years ; to the manuscript reviewers from Bell Tele phone Laboratories for their helpful comments. But most of all, I want to thank my wife and my children, who have been patient and understanding beyond measure. This book is dedicated to them. XI
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