The Stacks project

Definition 37.35.1. Let $S$ be a scheme. Let $s \in S$ be a point.

  1. An étale neighbourhood of $(S, s)$ is a pair $(U, u)$ together with an étale morphism of schemes $\varphi : U \to S$ such that $\varphi (u) = s$.

  2. A morphism of étale neighbourhoods $f : (V, v) \to (U, u)$ of $(S, s)$ is simply a morphism of $S$-schemes $f : V \to U$ such that $f(v) = u$.

  3. An elementary étale neighbourhood is an étale neighbourhood $\varphi : (U, u) \to (S, s)$ such that $\kappa (s) = \kappa (u)$.

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