Lemma 101.4.15. A monomorphism of algebraic stacks is separated and DM. The same is true for immersions of algebraic stacks.
Proof. If f : \mathcal{X} \to \mathcal{Y} is a monomorphism of algebraic stacks, then \Delta _ f is an isomorphism, see Properties of Stacks, Lemma 100.8.4. Since an isomorphism of algebraic spaces is proper and unramified we see that f is separated and DM. The second assertion follows from the first as an immersion is a monomorphism, see Properties of Stacks, Lemma 100.9.5. \square
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