viii CONTENTS
5.3. The Alexander module 181
5.4. A Seifert algorithm for knotted surfaces 188
Chapter 6. Algebraic Structures Related to Knotted Surface Diagrams 203
6.1. Generalizations of the Yang-Baxter equation 203
6.2. Category theory of knotted surfaces 214
6.3. Conclusion 241
Bibliography 243
Index 257
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