Lemma 71.17.8. Let S be a scheme. Let X be an algebraic space over S. Let b : X' \to X be the blowup of X in a closed subspace. If X satisfies the equivalent conditions of Morphisms of Spaces, Lemma 67.49.1 then so does X'.
Proof. Follows immediately from the lemma cited in the statement, the étale local description of blowing ups in Lemma 71.17.2, and Divisors, Lemma 31.32.10. \square
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