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Introducing Category Theory
Hardcover
ISBN13: 9781068346712
Publisher: Logic Matters
Published: Jun 1 2026
Pages: 530
Weight: 2.29
Height: 1.13 Width: 6.69 Depth: 9.61
Language: English
Modern pure mathematics explores abstract structures. Such structures cluster in interrelated families which form structures of structures. And these higher level structures are in turn interconnected in intricate ways. How can we explore such layers of increasing abstraction without getting lost? Category theory provides a basic toolkit, and it throws very revealing light on ideas which recur across mathematics.
This book - now in a third edition - is a based on a much-downloaded and frequently praised set of notes, and aims to give an introduction to some core categorial concepts. Part I looks inside categories, giving general treatments of familiar constructions such as forming products, quotients, exponentials, and more. Part II explores the functors that can map a construction in one category to the same sort of construction in another category, and we eventually encounter some distinctive novelties of category theory, such as the Yoneda Lemma and the concept of adjunctions. Part III looks more briefly at one kind of category, the elementary toposes in which we can reconstruct much mathematics.
The pace is gentle, with many theorems set as 'challenges' which are then given worked out proofs. So the book will provide very accessible preliminary or parallel reading for those starting a course on category theory. It will also be of interest to anyone who wants to get some sense of what the categorial fuss is about, as the book presupposes relatively little mathematical background.
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