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Definition (Towers). Let $\operatorname{\mathcal{C}}$ be an $\infty $-category. A tower in $\operatorname{\mathcal{C}}$ is a functor $\operatorname{N}_{\bullet }( \operatorname{\mathbf{Z}}_{\geq 0}^{\operatorname{op}} ) \rightarrow \operatorname{\mathcal{C}}$. We say that $\operatorname{\mathcal{C}}$ admits sequential limits if every tower in $\operatorname{\mathcal{C}}$ has a limit, and that $\operatorname{\mathcal{C}}$ admits sequential colimits if every diagram $\operatorname{N}_{\bullet }( \operatorname{\mathbf{Z}}_{\geq 0} ) \rightarrow \operatorname{\mathcal{C}}$ has a colimit. We say that a functor of $\infty $-categories $F: \operatorname{\mathcal{C}}\rightarrow \operatorname{\mathcal{D}}$ preserves sequential limits if it preserves limits indexed by the simplicial set $\operatorname{N}_{\bullet }( \operatorname{\mathbf{Z}}_{\geq 0}^{\operatorname{op}} )$, and that it preserves sequential colimits if it preserves colimits indexed by the simplicial set $\operatorname{N}_{\bullet }( \operatorname{\mathbf{Z}}_{\geq 0} )$.