The Stacks project

Lemma 71.2.4. Let $S$ be a scheme. Let $X$ be an algebraic space over $S$. Let $0 \to \mathcal{F}_1 \to \mathcal{F}_2 \to \mathcal{F}_3 \to 0$ be a short exact sequence of quasi-coherent sheaves on $X$. Then $\text{WeakAss}(\mathcal{F}_2) \subset \text{WeakAss}(\mathcal{F}_1) \cup \text{WeakAss}(\mathcal{F}_3)$ and $\text{WeakAss}(\mathcal{F}_1) \subset \text{WeakAss}(\mathcal{F}_2)$.

Proof. For every geometric point $\overline{x} \in X$ the sequence of stalks $0 \to \mathcal{F}_{1, \overline{x}} \to \mathcal{F}_{2, \overline{x}} \to \mathcal{F}_{3, \overline{x}} \to 0$ is a short exact sequence of $\mathcal{O}_{X, \overline{x}}$-modules. Hence the lemma follows from Algebra, Lemma 10.66.4. $\square$

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