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| Author | : Niles Johnson |
| Publisher | : Oxford University Press, USA |
| Total Pages | : 636 |
| Release | : 2021-01-31 |
| Genre | : Mathematics |
| ISBN | : 0198871376 |
2-Dimensional Categories is an introduction to 2-categories and bicategories, assuming only the most elementary aspects of category theory.
| Author | : Marco Grandis |
| Publisher | : World Scientific |
| Total Pages | : 535 |
| Release | : 2019-09-09 |
| Genre | : Mathematics |
| ISBN | : 9811205124 |
The study of higher dimensional categories has mostly been developed in the globular form of 2-categories, n-categories, omega-categories and their weak versions. Here we study a different form: double categories, n-tuple categories and multiple categories, with their weak and lax versions.We want to show the advantages of this form for the theory of adjunctions and limits. Furthermore, this form is much simpler in higher dimension, starting with dimension three where weak 3-categories (also called tricategories) are already quite complicated, much more than weak or lax triple categories.This book can be used as a textbook for graduate and postgraduate studies, and as a basis for research. Notions are presented in a 'concrete' way, with examples and exercises; the latter are endowed with a solution or hints. Part I, devoted to double categories, starts at basic category theory and is kept at a relatively simple level. Part II, on multiple categories, can be used independently by a reader acquainted with 2-dimensional categories.
| Author | : Tom Leinster |
| Publisher | : Cambridge University Press |
| Total Pages | : 193 |
| Release | : 2014-07-24 |
| Genre | : Mathematics |
| ISBN | : 1107044243 |
A short introduction ideal for students learning category theory for the first time.
| Author | : Saunders Mac Lane |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 320 |
| Release | : 2013-04-17 |
| Genre | : Mathematics |
| ISBN | : 1475747217 |
An array of general ideas useful in a wide variety of fields. Starting from the foundations, this book illuminates the concepts of category, functor, natural transformation, and duality. It then turns to adjoint functors, which provide a description of universal constructions, an analysis of the representations of functors by sets of morphisms, and a means of manipulating direct and inverse limits. These categorical concepts are extensively illustrated in the remaining chapters, which include many applications of the basic existence theorem for adjoint functors. The categories of algebraic systems are constructed from certain adjoint-like data and characterised by Beck's theorem. After considering a variety of applications, the book continues with the construction and exploitation of Kan extensions. This second edition includes a number of revisions and additions, including new chapters on topics of active interest: symmetric monoidal categories and braided monoidal categories, and the coherence theorems for them, as well as 2-categories and the higher dimensional categories which have recently come into prominence.
| Author | : Joachim Kock |
| Publisher | : Cambridge University Press |
| Total Pages | : 260 |
| Release | : 2004 |
| Genre | : Mathematics |
| ISBN | : 9780521540315 |
This 2003 book describes a striking connection between topology and algebra, namely that 2D topological quantum field theories are equivalent to commutative Frobenius algebras. The precise formulation of the theorem and its proof is given in terms of monoidal categories, and the main purpose of the book is to develop these concepts from an elementary level, and more generally serve as an introduction to categorical viewpoints in mathematics. Rather than just proving the theorem, it is shown how the result fits into a more general pattern concerning universal monoidal categories for algebraic structures. Throughout, the emphasis is on the interplay between algebra and topology, with graphical interpretation of algebraic operations, and topological structures described algebraically in terms of generators and relations. The book will prove valuable to students or researchers entering this field who will learn a host of modern techniques that will prove useful for future work.
| Author | : Bradd T. Hart |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 440 |
| Release | : |
| Genre | : Mathematics |
| ISBN | : 0821883828 |
Proceedings of a conference held at Centre de recherches mathematiques of the Universite de Montreal, June 18-20, 2009.
| Author | : Nick Gurski |
| Publisher | : Cambridge University Press |
| Total Pages | : 287 |
| Release | : 2013-03-21 |
| Genre | : Mathematics |
| ISBN | : 1107034892 |
Serves as an introduction to higher categories as well as a reference point for many key concepts in the field.
| Author | : John C. Baez |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 292 |
| Release | : 2009-09-24 |
| Genre | : Algebra |
| ISBN | : 1441915362 |
The purpose of this book is to give background for those who would like to delve into some higher category theory. It is not a primer on higher category theory itself. It begins with a paper by John Baez and Michael Shulman which explores informally, by analogy and direct connection, how cohomology and other tools of algebraic topology are seen through the eyes of n-category theory. The idea is to give some of the motivations behind this subject. There are then two survey articles, by Julie Bergner and Simona Paoli, about (infinity,1) categories and about the algebraic modelling of homotopy n-types. These are areas that are particularly well understood, and where a fully integrated theory exists. The main focus of the book is on the richness to be found in the theory of bicategories, which gives the essential starting point towards the understanding of higher categorical structures. An article by Stephen Lack gives a thorough, but informal, guide to this theory. A paper by Larry Breen on the theory of gerbes shows how such categorical structures appear in differential geometry. This book is dedicated to Max Kelly, the founder of the Australian school of category theory, and an historical paper by Ross Street describes its development.
| Author | : Emily Riehl |
| Publisher | : Cambridge University Press |
| Total Pages | : 782 |
| Release | : 2022-02-10 |
| Genre | : Mathematics |
| ISBN | : 1108952194 |
The language of ∞-categories provides an insightful new way of expressing many results in higher-dimensional mathematics but can be challenging for the uninitiated. To explain what exactly an ∞-category is requires various technical models, raising the question of how they might be compared. To overcome this, a model-independent approach is desired, so that theorems proven with any model would apply to them all. This text develops the theory of ∞-categories from first principles in a model-independent fashion using the axiomatic framework of an ∞-cosmos, the universe in which ∞-categories live as objects. An ∞-cosmos is a fertile setting for the formal category theory of ∞-categories, and in this way the foundational proofs in ∞-category theory closely resemble the classical foundations of ordinary category theory. Equipped with exercises and appendices with background material, this first introduction is meant for students and researchers who have a strong foundation in classical 1-category theory.
| Author | : Pavel Etingof |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 362 |
| Release | : 2016-08-05 |
| Genre | : Mathematics |
| ISBN | : 1470434415 |
Is there a vector space whose dimension is the golden ratio? Of course not—the golden ratio is not an integer! But this can happen for generalizations of vector spaces—objects of a tensor category. The theory of tensor categories is a relatively new field of mathematics that generalizes the theory of group representations. It has deep connections with many other fields, including representation theory, Hopf algebras, operator algebras, low-dimensional topology (in particular, knot theory), homotopy theory, quantum mechanics and field theory, quantum computation, theory of motives, etc. This book gives a systematic introduction to this theory and a review of its applications. While giving a detailed overview of general tensor categories, it focuses especially on the theory of finite tensor categories and fusion categories (in particular, braided and modular ones), and discusses the main results about them with proofs. In particular, it shows how the main properties of finite-dimensional Hopf algebras may be derived from the theory of tensor categories. Many important results are presented as a sequence of exercises, which makes the book valuable for students and suitable for graduate courses. Many applications, connections to other areas, additional results, and references are discussed at the end of each chapter.
