Structure of Regular Semigroups. I
Structure of Regular Semigroups. I

Author: K. S. S. Nambooripad

Publisher: American Mathematical Soc.

Published: 1979

Total Pages: 132

ISBN-13: 0821822241

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The structure of regular semigroups is studied in full generality. The principal tool used in this is the concept of a (regular) biordered set which abstractly characterizes the set of idempotents of a regular semigroup. The category of inductive groupoids is then defined as the category whose objects are pairs consisting of an ordered groupoid and an order-preserving functor of the chain groupoid of a biordered set whose vertex map is a bijection, and whose morphisms are certain commutative diagrams in the category of ordered groupoids. It is shown by an explicit construction that every regular semigroup can be constructed from an inductive groupoid and that the category of inductive groupoids is equivalent to the category of all regular semigroups. This construction is then applied to obtain the structure of all fundamental regular semigroups and all idempotent generated regular semigroups. The paper ends with a study of biordered sets of some important classes of regular semigroups.

Semigroups
Semigroups

Author: Pierre A. Grillet

Publisher: Routledge

Published: 2017-11-22

Total Pages: 417

ISBN-13: 1351417029

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This work offers concise coverage of the structure theory of semigroups. It examines constructions and descriptions of semigroups and emphasizes finite, commutative, regular and inverse semigroups. Many structure theorems on regular and commutative semigroups are introduced.;College or university bookstores may order five or more copies at a special student price which is available upon request from Marcel Dekker, Inc.

Semigroups, Categories, and Partial Algebras
Semigroups, Categories, and Partial Algebras

Author: P. G. Romeo

Publisher: Springer Nature

Published: 2021-03-26

Total Pages: 249

ISBN-13: 9813348429

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This book is a collection of selected papers presented at the International Conference on Semigroups and Applications, held at the Cochin University of Science and Technology, India, from December 9–12, 2019. This book discusses the recent developments in semigroups theory, category theory and the applications of these in various areas of research, including structure theory of semigroups, lattices, rings and partial algebras. This book presents chapters on ordering orders and quotient rings, block groups and Hall’s relations, quotients of the Booleanization of inverse semigroup, Markov chains through semigroup graph expansions, polycyclic inverse monoids and Thompson group, balanced category and bundle category. This book will be of much value to researchers working in areas of semigroup and operator theory.

Semigroups
Semigroups

Author: Thomas Eric Hall

Publisher:

Published: 1980

Total Pages: 280

ISBN-13:

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These proceedings are the culmination of four weeks of workshop sessions, research, and discussion at Monash University before the conference on October 27-30, 1979. Subjects for papers were suggested by the results of these workshop sessions, by the mathematical preferences of the organizing committee, current research in semigroup theory, and suggestions by authors. One such submission discusses the importance of semigroups in the analysis of the foundations of scientific thinking. These proceedings offer new, unpublished results and present a summary of the current state of play in semigroup research.

Semigroups, Algebras and Operator Theory
Semigroups, Algebras and Operator Theory

Author: P G Romeo

Publisher: Springer

Published: 2015-07-06

Total Pages: 219

ISBN-13: 8132224884

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This book discusses recent developments in semigroup theory and its applications in areas such as operator algebras, operator approximations and category theory. All contributing authors are eminent researchers in their respective fields, from across the world. Their papers, presented at the 2014 International Conference on Semigroups, Algebras and Operator Theory in Cochin, India, focus on recent developments in semigroup theory and operator algebras. They highlight current research activities on the structure theory of semigroups as well as the role of semigroup theoretic approaches to other areas such as rings and algebras. The deliberations and discussions at the conference point to future research directions in these areas. This book presents 16 unpublished, high-quality and peer-reviewed research papers on areas such as structure theory of semigroups, decidability vs. undecidability of word problems, regular von Neumann algebras, operator theory and operator approximations. Interested researchers will find several avenues for exploring the connections between semigroup theory and the theory of operator algebras.

Finitely Generated Commutative Monoids
Finitely Generated Commutative Monoids

Author: J. C. Rosales

Publisher: Nova Publishers

Published: 1999

Total Pages: 204

ISBN-13: 9781560726708

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A textbook for an undergraduate course, requiring only a knowledge of basic linear algebra. Explains how to compute presentations for finitely generated cancellative monoids, and from a presentation of a monoid, decide whether this monoid is cancellative, reduced, separative, finite, torsion free, group, affine, full, normal, etc. Of most interest to people working with semigroup theory, but also in other areas of algebra. Annotation copyrighted by Book News, Inc., Portland, OR

Semigroup Algebras
Semigroup Algebras

Author: Jan Okninski

Publisher: CRC Press

Published: 2020-08-27

Total Pages: 319

ISBN-13: 1000147665

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Gathers and unifies the results of the theory of noncommutative semigroup rings, primarily drawing on the literature of the last 10 years, and including several new results. Okninski (Warsaw U., Poland) restricts coverage to the ring theoretical properties for which a systematic treatment is current

Semigroups and Their Applications
Semigroups and Their Applications

Author: Simon M. Goberstein

Publisher: Springer Science & Business Media

Published: 1987-04-30

Total Pages: 230

ISBN-13: 9789027724632

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Most papers published in this volume are based on lectures presented at the Chico Conference on Semigroups held on the Chico campus of the Cal ifornia State University on April 10-12, 1986. The conference was spon sored by the California State University, Chico in cooperation with the Engineering Computer Sciences Department of the Pacific Gas and Electric Company. The program included seven 50-minute addresses and seventeen 30-minute lectures. Speakers were invited by the organizing committee consisting of S. M. Goberstein and P. M. Higgins. The purpose of the conference was to bring together some of the leading researchers in the area of semigroup theory for a discussion of major recent developments in the field. The algebraic theory of semigroups is growing so rapidly and new important results are being produced at such a rate that the need for another meeting was well justified. It was hoped that the conference would help to disseminate new results more rapidly among those working in semi groups and related areas and that the exchange of ideas would stimulate research in the subject even further. These hopes were realized beyond all expectations.

Semigroups
Semigroups

Author: T. E. Hall

Publisher: Academic Press

Published: 2014-05-10

Total Pages: 266

ISBN-13: 1483267334

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Semigroups is a collection of papers dealing with models of classical statistics, sequential computing machine, inverse semi-groups. One paper explains the structure of inverse semigroups that leads to P-semigroups or E-unitary inverse semigroups by utilizing the P-theorem of W.D. Nunn. Other papers explain the characterization of divisibility in the category of sets in terms of images and relations, as well as the universal aspects of completely simple semigroups, including amalgamation, the lattice of varieties, and the Hopf property. Another paper explains finite semigroups which are extensions of congruence-free semigroups, where their set of congruences forms a chain. The paper then shows how to construct such semigroups. A finite semigroup (which is decomposable into a direct product of cyclic semigroups which are not groups) is actually uniquely decomposable. One paper points out when a finite semigroup has such a decomposition, and how its non-group cyclic direct factors, if any, can be found. The collection can prove useful for mathematicians, statisticians, students, and professors of higher mathematics or computer science.