Hey, This fall I am taking my first proof based course, in set theory, and there is currently "NO BOOK" available from our bookstore. All of the other books are listed, and the math department's publication also listed as "NO BOOK". I knew someone who took this course last spring, and they had a book. I don't really want to pester the professor, because this will likely be discussed when class starts, but I am a little curious/disconcerted. I really like having a book for reference/self teaching myself if something happens and I miss lecture or something. What do you guys think? Do you think that the course could actually not have a book? I think I am going to call the math department, not the professor. Do you think they could answer the question?