Definition 7.52.1. Let \mathcal{C} be a category. Let J be a topology on \mathcal{C}. A point p of the topology is given by a functor u : \mathcal{C} \to \textit{Sets} such that
For every covering sieve S on U the map S_ p \to (h_ U)_ p is surjective.
The stalk functor \mathop{\mathit{Sh}}\nolimits (\mathcal{C}) \to \textit{Sets}, \mathcal{F} \to \mathcal{F}_ p is exact.
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