93.8.2.1
$$\label{algebraic-equation-morphisms-spaces} \mathop{\mathrm{Mor}}\nolimits _{\textit{Cat}/(\mathit{Sch}/S)_{fppf}}(\mathcal{X}, \mathcal{Y}) \Big/ 2\text{-isomorphism} = \mathop{\mathrm{Mor}}\nolimits _{\mathit{Sch}/S}(F, G)$$

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