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Corollary 9.5.5.7. Let $\kappa \trianglelefteq \lambda $ be regular cardinals, let $\operatorname{\mathcal{C}}$ be an $\infty $-category which is $(\kappa ,\lambda )$-compactly generated, and let $\operatorname{\mathcal{C}}_{< \kappa } \subseteq \operatorname{\mathcal{C}}$ denote the full subcategory spanned by the $(\kappa ,\lambda )$-compact objects. The following conditions are equivalent:

$(1)$

The $\infty $-category $\operatorname{\mathcal{C}}$ is $\lambda $-cocomplete.

$(2)$

The $\infty $-category $\operatorname{\mathcal{C}}$ is $\kappa $-cocomplete.

$(3)$

The $\infty $-category $\operatorname{\mathcal{C}}_{< \kappa }$ is $\kappa $-cocomplete.

Proof. The implication $(1) \Rightarrow (2)$ is immediate, the implication $(2) \Rightarrow (3)$ follows from Proposition 9.2.5.24, and the implication $(3) \Rightarrow (1)$ follows from Corollary 9.5.5.6. $\square$