Memoirs of the American Mathematical Society 1999; 180 pp; softcover Volume: 142 ISBN10: 0821813617 ISBN13: 9780821813614 List Price: US$60 Individual Members: US$36 Institutional Members: US$48 Order Code: MEMO/142/677
 Readership Graduate students and research mathematicians interested in associative rings and algebras. Table of Contents  Introduction
 Tools
 Squared coalgebras
 Squared bicoalgebras
 Hopf coalgebras
 Quasitriangular Hopf coalgebras
 Appendix A. Symmetric monoidal 2categories
 Bibliography
