Books
Full-length books, not summaries. Each one is built in 9 parts that run in teaching order, and every part carries two layers — a slow beginner path and a research-grade advanced path — so the same book works the first time you meet a topic and the week before the paper.
36 sections you can read right now
Every part page reproduces its opening section in full, figures included, with no sign-in and no paywall. Start anywhere below.
Open a book to see its nine parts, the sections inside each one, and the free extract that opens every part.