Situation 94.15.1. Here

$S$ is a scheme contained in $\mathit{Sch}_{fppf}$,

$B$ is an algebraic space over $S$,

$(G, m)$ is a group algebraic space over $B$,

$\pi : X \to B$ is an algebraic space over $B$, and

$a : G \times _ B X \to X$ is an action of $G$ on $X$ over $B$.

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