The Stacks project

Definition 101.26.2. Let $f : \mathcal{X} \to \mathcal{Y}$ be a morphism of algebraic stacks. Let $x \in |\mathcal{X}|$. We say $f$ is flat at $x$ if the equivalent conditions of Lemma 101.26.1 hold.

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View Definition 101.26.2 as pdf