Kerodon

\begin{equation} \begin{gathered}\label{equation:commutativity-as-morphism-of-coupling2} \xymatrix@R =50pt@C=50pt{ \operatorname{\mathcal{C}}\ar [d]^{\lambda } \ar [r]^-{ \widetilde{T} } & \operatorname{Tw}(\operatorname{\mathcal{D}}_{-} ) \ar [d] \\ \operatorname{\mathcal{C}}_{-}^{\operatorname{op}} \times \operatorname{\mathcal{C}}_{+} \ar [r]^-{ F^{\operatorname{op}}_{-} \times T_{+} } & \operatorname{\mathcal{D}}_{-}^{\operatorname{op}} \times \operatorname{\mathcal{D}}_{-}, } \end{gathered} \end{equation}