Lemma 77.26.2. Assume $B \to S$ and $(U, R, s, t, c)$ as in Definition 77.20.1 (1). Let $G/U$ be the stabilizer group algebraic space of the groupoid $(U, R, s, t, c, e, i)$, see Definition 77.16.2. There is a canonical $2$-cartesian diagram

of stacks in groupoids of $(\mathit{Sch}/S)_{fppf}$.

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