Definition 78.3.1. Let $S$ be a scheme contained in $\mathit{Sch}_{fppf}$. Let $F$, $G$ be presheaves on $\mathit{Sch}_{fppf}/S$. We say a morphism $a : F \to G$ is *representable by algebraic spaces* if for every $U \in \mathop{\mathrm{Ob}}\nolimits ((\mathit{Sch}/S)_{fppf})$ and any $\xi : U \to G$ the fiber product $U \times _{\xi , G} F$ is an algebraic space.

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