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The Stacks project

Lemma 101.43.1. Let f : \mathcal{X} \to \mathcal{Y} be a morphism of algebraic stacks. Assume f is of finite type and quasi-separated. Then the following are equivalent

  1. f is proper, and

  2. f satisfies both the uniqueness and existence parts of the valuative criterion.

Proof. A proper morphism is the same thing as a separated, finite type, and universally closed morphism. Thus this lemma follows from Lemmas 101.41.2, 101.41.3, 101.42.1, and 101.42.2. \square

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