Divine Proportions: Rational Trigonometry to Universal Geometry
N J Wildberger (PhD Yale 1984) is currently Associate Professor at UNSW in Sydney Australia, and has taught at Stanford University and the University of Toronto. His main research interests are Lie theory, representation theory and hypergroups. He has also done work in number theory, combinatorics and mathematical physics.    He is married, and lives in Sydney with his wife Kim and daughter Ali. This is his first book.