Lemma 35.23.29. The property $\mathcal{P}(f) =$“$f$ is étale” is fpqc local on the base.

**Proof.**
A morphism is étale if and only if it flat and G-unramified. See Morphisms, Lemma 29.36.16. We have seen already that being flat and G-unramified are fpqc local on the base (Lemmas 35.23.15, and 35.23.28). Hence the result follows.
$\square$

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