Definition 7.7.6. Let \mathcal{C} be a site, let \mathcal{A} be a category and let \mathcal{F} be a presheaf on \mathcal{C} with values in \mathcal{A}. We say that \mathcal{F} is a sheaf if for all objects X of \mathcal{A} the presheaf of sets \mathcal{F}_ X (defined above) is a sheaf.
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