Knotted Surfaces and Their Diagrams

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American Mathematical Soc., 1998 - Mathematics - 258 pages
In this book the authors develop the theory of knotted surfaces in analogy with the classical case of knotted curves in 3-dimensional space. In the first chapter knotted surface diagrams are defined and exemplified; these are generic surfaces in 3-space 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 labelled 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 movies are presented. In the fourth chapter properites of the projections of knotted surfaces are studies. Oriented surfaces in 4-space are shown to have planar projections without cusps and without branch points. Signs of triple points are studied. Applications of triple-point smoothing that include proofs of triple-point formulas and a proof of Whitney's congruence on normal Euler classes are presented.
 

Contents

Chapter 1 Diagrams of Knotted Surfaces
1
Chapter 2 Moving Knotted Surfaces
41
Chapter 3 Braid Theory in Dimension Four
97
Chapter 4 Combinatorics of Knotted Surface Diagrams
131
Chapter 5 The Fundamental Group and the Seifert Algorithm
169
Chapter 6 Algebraic Structures Related to Knotted Surface Diagrams
203
Bibliography
243
Index
257
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