Preface xvn Acknowledgments This book has greatly profited from collaborations and discussions with W. Bulla, F. Gesztesy, H. Holden, M. Krishna, and B. Simon. In addition, many people generously devoted considerable time and effort to reading earlier versions of the manuscript and making many corrections. In particular, I wish to thank D. Damanik, H. Hanfimann, A. von der Heyden, R. Killip, T. S0rensen, S. Timischl, K. Unterkofler, and H. Widom. Next, I am happy to express my gratitude to P. Deift, J. Geronimo, and E. Lieb for helpful suggestions and advise. I also like to thank the staff at the American Mathematical Society for the fast and professional production of this book. Partly supported by the Austrian Science Fund (http: //www. f wf . ac. a t / ) un- der Grant No. P12864-MAT. Finally, no book is free of errors. So if you find one. or if you have comments or suggestions, please let me know. I will make all corrections and complements available at the URL above. Gerald Teschl Vienna, Austria May, 1999 Gerald Teschl Institut fur Mathematik Universitat Wien Strudlhofgasse 4 1090 Wien, Austria E-mail address: gerald@mat. univie . ac . at URL: http://www.mat /
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