In this book the authors develop the theory of knotted surfaces in analogy with the classical case of knotted curves in 3dimensional space. In the first chapter knotted surface diagrams are defined and exemplified; these are generic surfaces in 3space with crossing information given. The diagrams are further enhanced to give alternative descriptions. A knotted surface can be described as a movie, as a kind of labeled planar graph, or as a sequence of words in which successive words are related by grammatical changes. In the second chapter, the theory of Reidemeister moves is developed in the various contexts. The authors show how to unknot intricate examples using these moves. The third chapter reviews the braid theory of knotted surfaces. Examples of the Alexander isotopy are given, and the braid movie moves are presented. In the fourth chapter, properties of the projections of knotted surfaces are studied. Oriented surfaces in 4space are shown to have planar projections without cusps and without branch points. Signs of triple points are studied. Applications of triplepoint smoothing that include proofs of triplepoint formulas and a proof of Whitney's congruence on normal Euler classes are presented. The fifth chapter indicates how to obtain presentations for the fundamental group and the Alexander modules. Key examples are worked in detail. The Seifert algorithm for knotted surfaces is presented and exemplified. The sixth chapter relates knotted surfaces and diagrammatic techniques to 2categories. Solutions to the Zamolodchikov equations that are diagrammatically obtained are presented. The book contains over 200 illustrations that illuminate the text. Examples are worked out in detail, and readers have the opportunity to learn firsthand a series of remarkable geometric techniques. Readership Graduate students, research mathematicians, physicists, and computer graphics experts interested in knots and links. Reviews "The authors must be congratulated on their heroic endeavors to bring known and unknown results into one book. Who should buy this book? Certainly all topologists with geometric leanings should do so, and their students too."  Bulletin of the London Mathematical Society Table of Contents  Diagrams of knotted surfaces
 Moving knotted surfaces
 Braid theory in dimension four
 Combinatorics of knotted surface diagrams
 The fundamental group and the Seifert algorithm
 Algebraic structures related to knotted surface diagrams
 Bibliography
 Index
