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An Invitation to Applied Category Theory: Seven Sketches
Category theory is now a powerful tool in science, informatics, and industry. This book offers a selfcontained tour of applied category theory. Each chapter follows a single thread motivated by a realworld application and discussed with categorytheoretic tools.

Category Theory in Context (Emily Riehl)
This book introduces the essential concepts of category theory: categories, functors, natural transformations, the Yoneda lemma, limits and colimits, adjunctions, monads, Kan extensions, and other topics.

Topology: A Categorical Approach (TaiDanae Bradley, et al)
A graduatelevel textbook that presents basic topology from the perspective of category theory. Many graduate students are familiar with the ideas of pointset topology and they are ready to learn something new about them.

Basic Category Theory (Tom Leinster)
Assuming little mathematical background, this short introduction to Category Theory is ideal for beginning graduate students or advanced undergraduates learning category theory for the first time.

Category Theory for the Sciences (David I. Spivak)
Using databases as an entry to Category Theory, this book explains category theory by examples, and shows that category theory can be useful outside of mathematics as a rigorous, flexible, and coherent modeling language throughout the sciences.

Category Theory for Programmers (Bartosz Milewski)
In this category theory for programmers, the author illustrates all major concepts using computer code. You are probably aware that functional languages are closer to math than the more popular imperative languages. They also offer more abstracting power.

Categories, Types, and Structures (Andrea Asperti, et al)
This book introduces Category Theory at a level appropriate for computer scientists and provides practical examples in the context of programming language design. It pursues the more complex mathematical semantics of data types and programs.

Categorical Homotopy Theory (Emily Riehl)
This book develops abstract homotopy theory from the categorical perspective with a particular focus on examples. It helps consolidate and simplify one's understanding of derived functors, homotopy limits and colimits, and model categories, among others.

Higher Topos Theory (Jacob Lurie)
This book presents the foundations of Higher Topos Theory, using the language of weak Kan complexes, and shows how existing theorems in algebraic topology can be reformulated and generalized in the theory's new language.