The notes contain the material that I use when preparing lectures for a course I gave from the mid 1980's until 1994; in that sense they are my lecture notes. "Lectures were once useful, but now when all can read, and books are so nu- merous, lectures are unnecessary." Samuel Johnson, 1799. Lecture notes have been around for centuries, either informally, as handwritten notes, or formally as textbooks. Recently improvements in typesetting have made it easier to produce \personalised" printed notes as here, but there has been no fundamental change. Experience shows that very few people are able to use lecture notes as a substitute for lectures; if.
