Kerodon

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4.48
\begin{equation} \begin{gathered}\label{equation:exponentiable-equivalent-condition2} \xymatrix@R =50pt@C=50pt{ \operatorname{\mathcal{D}}'' \ar [d]^{F} \ar [r] & \operatorname{\mathcal{E}}_0 \ar [d]^{T_0} \\ \operatorname{\mathcal{D}}' \ar [r] \ar@ {-->}[ur] & \operatorname{\mathcal{E}}'_0 } \end{gathered} \end{equation}