Lemma 37.41.6. Let f : X \to S be a morphism of schemes. Let s \in S. Assume that
f is locally of finite type,
f is separated, and
X_ s has at most finitely many isolated points.
Then there exists an elementary étale neighbourhood (U, u) \to (S, s) and a decomposition
into open and closed subschemes such that the morphism V \to U is finite, and the fibre W_ u of the morphism W \to U contains no isolated points. In particular, if f^{-1}(s) is a finite set, then W_ u = \emptyset .
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