vi PREFACE In the preparation of my lectures I had many helpful discussions with my close colleagues, Benny Evans, John Hempel and Peter Shalen. Their help has been extended to the completion of the writing of these lecture notes. In the preparation of the manuscript, I have been assisted by John Rice, the staff at The Institute for Advanced Study, especially Elizabeth Gorman Moyer and Gail Sydow, and at Rice University by Anita Poley. I dedicate this manuscript to my wife, Linda, who has been under- standing and constantly supportive over the long period of time that I have spent in its preparation. William Jaco Houston, Texas July, 1979
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