101.5.2.1

\begin{equation} \label{stacks-morphisms-equation-exact-sequence-isom} 0 \to \mathit{Isom}_{\mathcal{X}/\mathcal{Y}}(x, x) \to \mathit{Isom}_\mathcal {X}(x, x) \to \mathit{Isom}_\mathcal {Y}(y, y) \end{equation}

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