Lemma 101.7.6. Let
be a 2-commutative diagram of morphisms of algebraic stacks. If f is surjective and p is quasi-compact, then q is quasi-compact.
Lemma 101.7.6. Let
be a 2-commutative diagram of morphisms of algebraic stacks. If f is surjective and p is quasi-compact, then q is quasi-compact.
Proof. Let \mathcal{T} be a quasi-compact algebraic stack, and let \mathcal{T} \to \mathcal{Z} be a morphism. By Properties of Stacks, Lemma 100.5.3 the morphism \mathcal{T} \times _\mathcal {Z} \mathcal{X} \to \mathcal{T} \times _\mathcal {Z} \mathcal{Y} is surjective and by assumption \mathcal{T} \times _\mathcal {Z} \mathcal{X} is quasi-compact. Hence \mathcal{T} \times _\mathcal {Z} \mathcal{Y} is quasi-compact by Properties of Stacks, Lemma 100.6.2. \square
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