Definition 10.144.1. Let $R$ be a ring. Let $g , f \in R[x]$. Assume that $f$ is monic and the derivative $f'$ is invertible in the localization $R[x]_ g/(f)$. In this case the ring map $R \to R[x]_ g/(f)$ is said to be standard étale.
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Comment #8133 by Oren Ben-Bassat on
Comment #8134 by Oren Ben-Bassat on
Comment #8230 by Stacks Project on