91.15.0.1

\begin{equation} \label{cotangent-equation-tensor-product} \vcenter { \xymatrix{ L_{A/R} \otimes _ A^\mathbf {L} (A \otimes _ R B) \ar[r] & L_{A \otimes _ R B/B} \ar[r] & E \\ L_{A/R} \otimes _ A^\mathbf {L} (A \otimes _ R B) \ar[r] \ar@{=}[u] & L_{A \otimes _ R B/R} \ar[r] \ar[u] & L_{A \otimes _ R B/A} \ar[u] \\ & L_{B/R} \otimes _ B^\mathbf {L} (A \otimes _ R B) \ar[u] \ar@{=}[r] & L_{B/R} \otimes _ B^\mathbf {L} (A \otimes _ R B) \ar[u] } } \end{equation}

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