I decided instead to prepare an almost verbatim record of what I said in the dass the next time I taught the course. This was easier thought than done. The notes written in parts over three different years of teaching were finally ready in 2004. This background should explain the somewhat unusual format of the book. Unlike the typical text it is not divided into chapters and sections, and it is neither self-contained nor comprehensive. The division is into lectures each corresponding to a 90 minutes dassroom session. Each is broken into small units that are numbered.
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