Kerodon

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Definition 5.6.3.11. Let $\operatorname{\mathcal{E}}$ be an $\infty $-category. We say that $\operatorname{\mathcal{E}}$ is essentially small if there exists an equivalence of $\infty $-categories $\operatorname{\mathcal{E}}\rightarrow \operatorname{\mathcal{E}}'$, where $\operatorname{\mathcal{E}}'$ is a small $\infty $-category.