Subsection 8.9.5 (019F): The $2$-Category of Groupoids

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Table of Contents
Part 3: Category Theory
Chapter 8: Categories
Section 8.9: Categories of Categories
Subsection 8.9.5: The $2$-Category of Groupoids (cite)

8.9.5 The $2$-Category of Groupoids

Definition 8.9.5.1.1 ▶ The $2$-Category of Small Groupoids

The $2$-category of (small) groupoids is the full sub-$2$-category $\mathsf{Grpd}_{\mathsf{2}}$ of $\mathsf{Cats}_{\mathsf{2}}$ spanned by the groupoids.

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