I am very grateful to the patient and diligent students at Illinois, as well as readers around the world, for pointing out errors and rough spots, though many remain almost surely. I welcome email pointing out errors or hard to understand passages.
Permission is hereby given to freely print and circulate copies of these
notes so long as the notes are left intact and not reproduced for
commercial purposes.
B. Hajek
b-hajek at uiuc.edu