Lemma 101.18.4. Let f : \mathcal{X} \to \mathcal{Y} be a morphism of algebraic stacks. If f is locally of finite type, then f(\mathcal{X}_{\text{ft-pts}}) \subset \mathcal{Y}_{\text{ft-pts}}.
Proof. Take x \in \mathcal{X}_{\text{ft-pts}}. Represent x by a locally finite type morphism x : \mathop{\mathrm{Spec}}(k) \to \mathcal{X}. Then f \circ x is locally of finite type by Lemma 101.17.2. Hence f(x) \in \mathcal{Y}_{\text{ft-pts}}. \square
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