ESSLLI'06 lecture notes

Hi Frogs,

Since I am going to give a course at this year's ESSLLI, I produced some 
lecture notes, which are available here:

http://www.lix.polytechnique.fr/~lutz/papers/ESSLLI06notes.pdf

I've tried to make them easy to understand and not too technical. But since I 
wrote them from scratch in less than 6 weeks, it is not as smooth as I planned. 
In the end I could not explain everything as detailed as I wanted because I was 
running out of time and space (I had only 100 pages maximum). Nonetheless, I 
appreciate any comments for improving the course. I surely will not cover 
everything that is in the notes, but I have not yet decided what to include and 
what to leave out.

Ciao,
Lutz