Definition 71.7.4. Let $S$ be a scheme. Let $X$ be an algebraic space over $S$. Let $\mathcal{L}$ be an invertible sheaf on $X$. A global section $s \in \Gamma (X, \mathcal{L})$ is called a *regular section* if the map $\mathcal{O}_ X \to \mathcal{L}$, $f \mapsto fs$ is injective.

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