Interactive: Ethiopian Music Scales(temesgen.com)72 points by ggeorgovassilis 3 years ago | 14 comments
Feynman's Hughes Lectures: 950 pages of notes(thehugheslectures.info)158 points by gnubison 10 months ago | 35 comments
The geometry of mathematical methods(books.physics.oregonstate.edu)67 points by kalind 1 year ago | 4 comments
Online Textbook for Braid groups and knots and tangles(matthematics.com)39 points by marysminefnuf 10 months ago | 4 comments