The Stacks project

4.1 Introduction

Categories were first introduced in [GenEqui]. The category of categories (which is a proper class) is a $2$-category. Similarly, the category of stacks forms a $2$-category. If you already know about categories, but not about $2$-categories you should read Section 4.28 as an introduction to the formal definitions later on.

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View Section 4.1 as pdf