The Stacks project

Lemma 78.5.2. Let $B \to S$ as in Section 78.3. Let $(G, m)$ be a group algebraic space over $B$. Let $B' \to B$ be a morphism of algebraic spaces. The pullback $(G_{B'}, m_{B'})$ is a group algebraic space over $B'$.

Proof. Omitted. $\square$

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