Acknowledgments I would like to thank CBMS and NSF for sponsoring the conference C. Sim- mons and J. Byrne for the excellent organization and A. Basmajian, W. Jaco, E. Rowell, and S. Simon for giving invited lectures. It was a pleasure to lecture on an emerging field that is interdisciplinary and still rapidly developing. Over the years I have had the good fortune to work with many collaborators in math- ematics and physics, including M. Freedman, A. Kitaev, M. Larsen, A. Ludwig, C. Nayak, N. Read, K. Walker, and X.-G. Wen. Their ideas on the subject and other topics strongly influence my thinking, especially M. Freedman. He and I have been collaborating ever since I went to UCSD to study under him two decades ago. His influence on me and the field of topological quantum computation cannot be overstated. I also want to thank M. Fisher. Though not a collaborator, repeating his graduate course on condensed matter physics and having many questions an- swered by him, I started to appreciate the beautiful picture of our world painted with quantum field theory, and to gain confidence in physics. He richly deserves of my apple. In the same vein, I would like to thank V. Jones for bringing me to his mathematical world, and his encouragement. Jones’s world is home to me. Last but not least, I would like to thank J. Liptrap for typesetting the book and correcting many errors, and D. Sullivan for smoothing the language of the Preface. Of course, errors that remain are mine. xiii
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