Category theory in contextCategory theory in context Emily Riehl Chapter 6 is adapted with permission from Chapter 1 of Categorical Homotopy Theory, by Emily Riehl, Cambridge University Press. © Emily Riehl 2014 To Peter Johnstone, whose beautiful Part III lectures provided my first acquaintance with category theory and form the skeleton of this book. and To Martin Hyland, who guided my initial explorations of this subject
