Lemma 29.36.19. Let
be a commutative diagram of morphisms of schemes. Assume that
$f$ is surjective, and étale,
$p$ is étale, and
$q$ is locally of finite presentation1.
Then $q$ is étale.
Lemma 29.36.19. Let
be a commutative diagram of morphisms of schemes. Assume that
$f$ is surjective, and étale,
$p$ is étale, and
$q$ is locally of finite presentation1.
Then $q$ is étale.
Proof. By Lemma 29.34.19 we see that $q$ is smooth. Thus we only need to see that $q$ has relative dimension $0$. This follows from Lemma 29.28.2 and the fact that $f$ and $p$ have relative dimension $0$. $\square$
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