• Adjointness. We have adjunctions
    witnessed by bijections of sets
    \begin{align*} \textup{Hom}_{\mathsf{Cats}}\webleft (\mathcal{C}\times \mathcal{D},\mathcal{E}\webright ) & \cong \textup{Hom}_{\mathsf{Cats}}\webleft (\mathcal{D},\mathsf{Fun}\webleft (\mathcal{C},\mathcal{E}\webright )\webright ),\\ \textup{Hom}_{\mathsf{Cats}}\webleft (\mathcal{C}\times \mathcal{D},\mathcal{E}\webright ) & \cong \textup{Hom}_{\mathsf{Cats}}\webleft (\mathcal{C},\mathsf{Fun}\webleft (\mathcal{D},\mathcal{E}\webright )\webright ), \end{align*}

    natural in $\mathcal{C},\mathcal{D},\mathcal{E}\in \text{Obj}\webleft (\mathsf{Cats}\webright )$.


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