Is this an old draft of the book? http://saunders.phil.cmu.edu/book/hott-online.pdf http://saunders.phil.cmu.edu/book/hott-online.pdf EDIT: Should've read the

Is this an old draft of the book? http://saunders.phil.cmu.edu/book/hott-online.pdf http://saunders.phil.cmu.edu/book/hott-online.pdf EDIT: Should've read the first page, whoops; still, the book provides a lot more material, so if you're interested, give it a read next.