x PREFACE Exercises for the reader are embedded in the text. I strongly recommend that you work these out carefully. If you run out of patience, you can look up the answers to most of these exercises in the appendix. The first five chapters are largely based on a series of lectures that I gave at the 2005 Summer School in Aperiodic Order at the University of Victoria. I am grateful to the organizers and participants in this summer school for their enthusiasm and their moral support. I am also especially grateful to Margaret Combs for her TEXnical and artistic assistance. This book is partly based upon work supported by the National Science Foundation under Grant No. 0701055.
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