Most popular at the top The four-color problemby Oystein OreElsevier Science 2011; US$ 72.95The four-color problem more...Add to my wish listAdd to cartThe Mathematical Theory of Knots and Braidsby S. MoranElsevier Science 2000; US$ 255.00This book is an introduction to the theory of knots via the theory of braids, which attempts to be complete in a number of ways.