xiv Preface where updates, corrections, and other material may be found, including a link to material on my own web site: http://www.mat.univie.ac.at/~gerald/ftp/book-schroe/ Acknowledgments I would like to thank Volker Enß for making his lecture notes [20] avail- able to me. Many colleagues and students have made useful suggestions and pointed out mistakes in earlier drafts of this book, in particular: Kerstin Ammann, org Arnberger, Chris Davis, Fritz Gesztesy, Maria Hoffmann- Ostenhof, Zhenyou Huang, Helge Kr¨ uger, Katrin Grunert, Wang Lanning, Daniel Lenz, Christine Pfeuffer, Roland ows, Arnold L. Neidhardt, Serge Richard, Harald Rindler, Alexander Sakhnovich, Robert Stadler, Johannes Temme, Karl Unterkofler, Joachim Weidmann, Rudi Weikard, and David Wimmesberger. My thanks for pointing out mistakes in the first edition go to: Erik Makino Bakken, Alexander Beigl, Stephan Bogend¨ orfer, Søren Fournais, Semra Demirel-Frank, Katrin Grunert, Jason Jo, Helge Kr¨ uger, Oliver Lein- gang, Serge Richard, Gerardo Gonz´ alez Robert, Bob Sims, Oliver Skocek, Robert Stadler, Fernando Torres-Torija, Gerhard Tulzer, Hendrik Vogt, and David Wimmesberger. If you also find an error or if you have comments or suggestions (no matter how small), please let me know. I have been supported by the Austrian Science Fund (FWF) during much of this writing, most recently under grant Y330. Gerald Teschl Vienna, Austria April 2014 Gerald Teschl Fakult¨ at Mathematik Oskar-Morgenstern-Platz 1 Universit¨ at Wien 1090 Wien, Austria E-mail: Gerald.Teschl@univie.ac.at URL: http://www.mat.univie.ac.at/~gerald/
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