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 Title Categorical Homotopy Theory
 Author(s) Emily Riehl
 Publisher: Cambridge University Press (May 26, 2014); eBook (Johns Hopkins University)
 Permission: From the Author: Thanks to a special arrangement with Cambridge University Press, I am also able to host a free PDF copy. This version is free to view and download for personal use only. Not for redistribution, resale or use in derivative works.
 Hardcover/Paperback 372 pages
 eBook PDF
 Language: English
 ISBN10/ASIN: 1107048451/B00J8LQS80
 ISBN13: 9781107048454
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Book Description
This book develops abstract homotopy theory from the categorical perspective with a particular focus on examples.
Part I discusses two competing perspectives by which one typically first encounters homotopy (co)limits: either as derived functors definable when the appropriate diagram categories admit a compatible model structure, or through particular formulae that give the right notion in certain examples. Emily Riehl unifies these seemingly rival perspectives and demonstrates that model structures on diagram categories are irrelevant. Homotopy (co)limits are explained to be a special case of weighted (co)limits, a foundational topic in enriched category theory.
In Part II, Riehl further examines this topic, separating categorical arguments from homotopical ones. Part III treats the most ubiquitous axiomatic framework for homotopy theory  Quillen's model categories. Here, Riehl simplifies familiar model categorical lemmas and definitions by focusing on weak factorization systems. Part IV introduces quasicategories and homotopy coherence.
About the Authors Emily Riehl is an American mathematician who has contributed to higher category theory and homotopy theory. She is also the author of Category Theory in Context.
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