Definition 7.2.2. Let \mathcal{C}, \mathcal{A} be categories. A presheaf \mathcal{F} on \mathcal{C} with values in \mathcal{A} is a contravariant functor from \mathcal{C} to \mathcal{A}, i.e., \mathcal{F} : \mathcal{C}^{opp} \to \mathcal{A}. A morphism of presheaves \mathcal{F} \to \mathcal{G} on \mathcal{C} with values in \mathcal{A} is a transformation of functors from \mathcal{F} to \mathcal{G}.
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Comment #1016 by correction_bot on