Hopf Algebras and Galois Module Theory
Hopf Algebras and Galois Module Theory

Author: Lindsay N. Childs

Publisher: American Mathematical Soc.

Published: 2021-11-10

Total Pages: 311

ISBN-13: 1470465167

DOWNLOAD EBOOK

Hopf algebras have been shown to play a natural role in studying questions of integral module structure in extensions of local or global fields. This book surveys the state of the art in Hopf-Galois theory and Hopf-Galois module theory and can be viewed as a sequel to the first author's book, Taming Wild Extensions: Hopf Algebras and Local Galois Module Theory, which was published in 2000. The book is divided into two parts. Part I is more algebraic and focuses on Hopf-Galois structures on Galois field extensions, as well as the connection between this topic and the theory of skew braces. Part II is more number theoretical and studies the application of Hopf algebras to questions of integral module structure in extensions of local or global fields. Graduate students and researchers with a general background in graduate-level algebra, algebraic number theory, and some familiarity with Hopf algebras will appreciate the overview of the current state of this exciting area and the suggestions for numerous avenues for further research and investigation.

An Introduction to Hopf Algebras
An Introduction to Hopf Algebras

Author: Robert G. Underwood

Publisher: Springer Science & Business Media

Published: 2011-08-30

Total Pages: 283

ISBN-13: 0387727655

DOWNLOAD EBOOK

Only book on Hopf algebras aimed at advanced undergraduates

Taming Wild Extensions: Hopf Algebras and Local Galois Module Theory
Taming Wild Extensions: Hopf Algebras and Local Galois Module Theory

Author: Lindsay Childs

Publisher: American Mathematical Soc.

Published: 2000

Total Pages: 225

ISBN-13: 0821821318

DOWNLOAD EBOOK

This book studies Hopf algebras over valuation rings of local fields and their application to the theory of wildly ramified extensions of local fields. The results, not previously published in book form, show that Hopf algebras play a natural role in local Galois module theory. Included in this work are expositions of short exact sequences of Hopf algebras; Hopf Galois structures on separable field extensions; a generalization of Noether's theorem on the Galois module structure of tamely ramified extensions of local fields to wild extensions acted on by Hopf algebras; connections between tameness and being Galois for algebras acted on by a Hopf algebra; constructions by Larson and Greither of Hopf orders over valuation rings; ramification criteria of Byott and Greither for the associated order of the valuation ring of an extension of local fields to be Hopf order; the Galois module structure of wildly ramified cyclic extensions of local fields of degree p and p2; and Kummer theory of formal groups. Beyond a general background in graduate-level algebra, some chapters assume an acquaintance with some algebraic number theory. From there, this exposition serves as an excellent resource and motivation for further work in the field.

Brauer Groups, Hopf Algebras and Galois Theory
Brauer Groups, Hopf Algebras and Galois Theory

Author: Stefaan Caenepeel

Publisher: Springer Science & Business Media

Published: 2002-03-31

Total Pages: 516

ISBN-13: 9781402003462

DOWNLOAD EBOOK

This volume is devoted to the Brauer group of a commutative ring and related invariants. Part I presents a new self-contained exposition of the Brauer group of a commutative ring. Included is a systematic development of the theory of Grothendieck topologies and étale cohomology, and discussion of topics such as Gabber's theorem and the theory of Taylor's big Brauer group of algebras without a unit. Part II presents a systematic development of the Galois theory of Hopf algebras with special emphasis on the group of Galois objects of a cocommutative Hopf algebra. The development of the theory is carried out in such a way that the connection to the theory of the Brauer group in Part I is made clear. Recent developments are considered and examples are included. The Brauer-Long group of a Hopf algebra over a commutative ring is discussed in Part III. This provides a link between the first two parts of the volume and is the first time this topic has been discussed in a monograph. Audience: Researchers whose work involves group theory. The first two parts, in particular, can be recommended for supplementary, graduate course use.

Advances in Hopf Algebras
Advances in Hopf Algebras

Author: Jeffrey Bergen

Publisher: CRC Press

Published: 2023-08-18

Total Pages: 341

ISBN-13: 1000944948

DOWNLOAD EBOOK

"This remarkable reference covers topics such as quantum groups, Hopf Galois theory, actions and coactions of Hopf algebras, smash and crossed products, and the structure of cosemisimple Hopf algebras. "

Hopf Algebra
Hopf Algebra

Author: Sorin Dascalescu

Publisher: CRC Press

Published: 2000-09-15

Total Pages: 420

ISBN-13: 1482270749

DOWNLOAD EBOOK

This study covers comodules, rational modules and bicomodules; cosemisimple, semiperfect and co-Frobenius algebras; bialgebras and Hopf algebras; actions and coactions of Hopf algebras on algebras; finite dimensional Hopf algebras, with the Nicholas-Zoeller and Taft-Wilson theorems and character theory; and more.

Fundamentals of Hopf Algebras
Fundamentals of Hopf Algebras

Author: Robert G. Underwood

Publisher: Springer

Published: 2015-06-10

Total Pages: 164

ISBN-13: 3319189913

DOWNLOAD EBOOK

This text aims to provide graduate students with a self-contained introduction to topics that are at the forefront of modern algebra, namely, coalgebras, bialgebras and Hopf algebras. The last chapter (Chapter 4) discusses several applications of Hopf algebras, some of which are further developed in the author’s 2011 publication, An Introduction to Hopf Algebras. The book may be used as the main text or as a supplementary text for a graduate algebra course. Prerequisites for this text include standard material on groups, rings, modules, algebraic extension fields, finite fields and linearly recursive sequences. The book consists of four chapters. Chapter 1 introduces algebras and coalgebras over a field K; Chapter 2 treats bialgebras; Chapter 3 discusses Hopf algebras and Chapter 4 consists of three applications of Hopf algebras. Each chapter begins with a short overview and ends with a collection of exercises which are designed to review and reinforce the material. Exercises range from straightforward applications of the theory to problems that are devised to challenge the reader. Questions for further study are provided after selected exercises. Most proofs are given in detail, though a few proofs are omitted since they are beyond the scope of this book.

Algebras, Rings and Modules
Algebras, Rings and Modules

Author: Michiel Hazewinkel

Publisher: American Mathematical Soc.

Published: 2010

Total Pages: 425

ISBN-13: 0821852620

DOWNLOAD EBOOK

Presenting an introduction to the theory of Hopf algebras, the authors also discuss some important aspects of the theory of Lie algebras. This book includes a chapters on the Hopf algebra of symmetric functions, the Hopf algebra of representations of the symmetric groups, the Hopf algebras of the nonsymmetric and quasisymmetric functions, and the Hopf algebra of permutations.

Hopf Algebras, Polynomial Formal Groups, and Raynaud Orders
Hopf Algebras, Polynomial Formal Groups, and Raynaud Orders

Author: Lindsay Childs

Publisher: American Mathematical Soc.

Published: 1998

Total Pages: 133

ISBN-13: 0821810774

DOWNLOAD EBOOK

This volume gives two new methods for constructing $p$-elementary Hopf algebra orders over the valuation ring $R$ of a local field $K$ containing the $p$-adic rational numbers. One method constructs Hopf orders using isogenies of commutative degree 2 polynomial formal groups of dimension $n$, and is built on a systematic study of such formal group laws. The other method uses an exponential generalization of a 1992 construction of Greither. Both constructions yield Raynaud orders as iterated extensions of rank $p$ Hopf algebras; the exponential method obtains all Raynaud orders whose invariants satisfy a certain $p$-adic condition.