Timeline of writing

I worked on the writing of this book with few breaks for a little over ten years, beginning in June 1991, and ending in January 2002. The chapters were written roughly as follows: Chapter 1: 1991, 1999, 2001; Chapter 2: 1991-2; Chapter 3: 1992; Chapter 4: 1992-3; Chapter 5: 1993; Chapter 6: 1992-3; Chapter 7: 1994-6; Chapter 8: 1994-5, 1997; Chapter 9: 1995-8, 2001; Chapter 10: 1998-9; Chapter 11: 1995; Chapter 12: 1999-2001. Some sections of chapters (usually later ones) were added well after the rest. These notes were also sometimes written well after the main text of a given chapter.