Higher Topos Theory (AM-170) (Annals of Mathematics Studies, 170)

Great!

This textbook has set itself up to become the analog of MacLane's "Categories for the Working Mathematician" for Higher Category Theory - the definitive text source for the subject. Higher category versions of Limits, Adjoints, Kan Extensions, etc. are treated, all leading up to the development of higher versions of Grothendieck's Topoi. A must for any budding categorical mathematician's library.

Great read, very entertaining -- gotta love the math!

$2,400 for a book. No f'n thank you. You must be into higher math if you're high enough to spend that much money on a BOOK.