The Stacks project

Definition 71.9.2. Let $S$ be a scheme. Let $f : X \to Y$ be a morphism of algebraic spaces over $S$. A relative effective Cartier divisor on $X/Y$ is an effective Cartier divisor $D \subset X$ such that $D \to Y$ is a flat morphism of algebraic spaces.

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View Definition 71.9.2 as pdf