• 2-Functoriality. The assignments $\mathcal{C},\mathcal{D},\webleft (\mathcal{C},\mathcal{D}\webright )\mapsto \mathsf{Fun}\webleft (\mathcal{C},\mathcal{D}\webright )$ define 2-functors
    \[ \begin{array}{ccc} \mathsf{Fun}\webleft (\mathcal{C},-\webright )\colon \mkern -15mu & \mathsf{Cats}_{\mathsf{2}} \mkern -17.5mu& {}\mathbin {\to }\mathsf{Cats}_{\mathsf{2}},\\ \mathsf{Fun}\webleft (-,\mathcal{D}\webright )\colon \mkern -15mu & \mathsf{Cats}_{\mathsf{2}}^{\mathrlap {\mathsf{op}}} \mkern -17.5mu& {}\mathbin {\to }\mathsf{Cats}_{\mathsf{2}},\\ \mathsf{Fun}\webleft (-_{1},-_{2}\webright )\colon \mkern -15mu & \mathsf{Cats}_{\mathsf{2}}^{\mathsf{op}}\times \mathsf{Cats}_{\mathsf{2}} \mkern -17.5mu& {}\mathbin {\to }\mathsf{Cats}_{\mathsf{2}}. \end{array} \]

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