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Monoidal Functors, Species and Hopf Algebras
Marcelo Aguiar, Texas A&M University, College Station, TX, and Swapneel Mahajan, Indian Institute of Technology, Mumbai, India
A co-publication of the AMS and Centre de Recherches Mathématiques.

CRM Monograph Series
2010; 784 pp; hardcover
Volume: 29
ISBN-10: 0-8218-4776-7
ISBN-13: 978-0-8218-4776-3
List Price: US$169
Member Price: US$135.20
Order Code: CRMM/29
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See also:

Galois Theory, Hopf Algebras, and Semiabelian Categories - George Janelidze, Bodo Pareigis and Walter Tholen

Hopf Algebras and Their Actions on Rings - Susan Montgomery

This research monograph integrates ideas from category theory, algebra and combinatorics. It is organized in three parts.

Part I belongs to the realm of category theory. It reviews some of the foundational work of Bénabou, Eilenberg, Kelly and Mac Lane on monoidal categories and of Joyal and Street on braided monoidal categories, and proceeds to study higher monoidal categories and higher monoidal functors. Special attention is devoted to the notion of a bilax monoidal functor which plays a central role in this work.

Combinatorics and geometry are the theme of Part II. Joyal's species constitute a good framework for the study of algebraic structures associated to combinatorial objects. This part discusses the category of species focusing particularly on the Hopf monoids therein. The notion of a Hopf monoid in species parallels that of a Hopf algebra and reflects the manner in which combinatorial structures compose and decompose. Numerous examples of Hopf monoids are given in the text. These are constructed from combinatorial and geometric data and inspired by ideas of Rota and Tits' theory of Coxeter complexes.

Part III is of an algebraic nature and shows how ideas in Parts I and II lead to a unified approach to Hopf algebras. The main step is the construction of Fock functors from species to graded vector spaces. These functors are bilax monoidal and thus translate Hopf monoids in species to graded Hopf algebras. This functorial construction of Hopf algebras encompasses both quantum groups and the Hopf algebras of recent prominence in the combinatorics literature.

The monograph opens a vast new area of research. It is written with clarity and sufficient detail to make it accessible to advanced graduate students.

Titles in this series are co-published with the Centre de Recherches Mathématiques.


Graduate students and research mathematicians interested in category theory, algebraic combinatorics, Hopf algebras, and Coxeter groups.


"The book of Aguiar and Mahajan is a quantum leap toward the mathematics of the future. I strongly recommend it to all researchers in algebra, topology, and combinatorics."

-- André Joyal

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