Lemma 75.16.7. An unramified flat morphism is formally étale.
Proof. Follows from the case of schemes, see More on Morphisms, Lemma 37.8.7 and étale localization, see Lemmas 75.14.2 and 75.16.2 and Morphisms of Spaces, Lemma 66.30.5. $\square$
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