4 1. Introduction Josh Nichols-Barrer and Thomas Lam for helping run the course in 2004 and for useful comments. He is also very grateful to Darij Grin- berg for his very careful reading of the text, for many useful comments and corrections, and for suggesting Problems 2.11.6, 3.3.3, 3.8.3, 3.8.4, 4.5.2, 5.10.2 and Exercises 5.27.2, 5.27.3, 7.9.8. Finally, the authors gratefully acknowledge the use of the Dynkin diagram pictures pre- pared by W. Casselman.
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