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Category theory provides a general conceptual framework that has proved fruitful in subjects as diverse as geometry, topology, theoretical computer science and foundational mathematics. Here is a friendly, easy-to-read textbook that explains the fundamentals at a level suitable for newcomers to the subject. Beginning postgraduate mathematicians will find this book an excellent introduction to all of the basics of category theory. It gives the basic definitions; goes through the various associated gadgetry, such as functors, natural transformations, limits and colimits; and then explains adjunctions. The material is slowly developed using many examples and illustrations to illuminate the concepts explained. Over 200 exercises, with solutions available online, help the reader to access the subject and make the book ideal for self-study. It can also be used as a recommended text for a taught introductory course.

Preface
1Categories
1.1 Categories defined
1.2 Categories of structured sets
1.3 An arrow need not be a function
1.4 More complicated categories
1.5 Two simple categories and a bonus
Basic gadgetry
2.1 Diagram chasing
2.2 Monics and epics
2.3 Simple limits and colimits
2.4 Initial and final objects
2.5 Products and coproducts
2.6 Equalizers and coequalizers
2.7 Pullbacks and pushouts
2.8 Using the opposite category
Functors and natural transformations
3.1 Functors defined
3.2 Some simple functors
3.3 Some less simple functors
3.4 Natural transformations defined
3.5 Examples of natural transformations
Limits and colimits in general
4.1 Template and diagram – a first pass
4.2 Functor categories
4.3 Problem and solution
4.4 Universal solution
4.5 A geometric limit and colimit
4.6 How to calculate certain limits
4.7 Confluent colimits in Set
Adjunctions
5.1 Adjunctions defined
5.2 Adjunctions illustrated
5.3 Adjunctions uncoupled
5.4 The unit and the counit
5.5 Free and cofree constructions
5.6 Contravariant adjunctions
Posets and monoid sets
6.1 Posets and complete posets
6.2 Two categories of complete posets
6.3 Sections of a poset
6.4 The two completions
6.5 Three endo-functors on Pos
6.6 Long strings of adjunctions
6.7 Two adjunctions for R-sets
6.8 The upper left adjoint
6.9 The upper adjunction
6.10 The lower right adjoint
6.11 The lower adjunction
6.12 Some final projects Bibliography Index
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