Title
Abstract
A knot is just a closed loop in a three-dimensional space. Strangely enough, there is a notion of factoring knots and even a prime factoring theorem, due to Horst Schubert. We hope that our presentation of this classic result will be accessible to advanced undergraduates.

Comments
Published in American Mathematical Monthly, 107(4), 297-315. Copyright © 2000 The Mathematical Association of America.