Lemma 78.27.2. Let S be a scheme. Let B be an algebraic space over S. Let G be a group algebraic space over B. Endow B with the trivial action of G. The morphism
[B/G] \longrightarrow \mathcal{S}_ B
(Lemma 78.20.2) turns [B/G] into a gerbe over B.
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