The Stacks project

Lemma 68.22.2. Let $S$ be a scheme. Let $f : X \to Y$ be a morphism of algebraic spaces over $S$ which are decent and have finitely many irreducible components. If $f$ is birational then $f$ is dominant.

Proof. Follows immediately from the definitions. See Morphisms of Spaces, Definition 67.18.1. $\square$

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