Definition 5.6.2.4. Let $\mathscr {F}: \operatorname{\mathcal{C}}\rightarrow \operatorname{\mathcal{QC}}$ be a functor of $\infty $-categories. We will refer to $\int _{\operatorname{\mathcal{C}}} \mathscr {F}$ as the $\infty $-category of elements of $\mathscr {F}$.
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