15.89.8.1

\begin{equation} \label{more-algebra-equation-glueing-complex} 0 \to M \xrightarrow {\alpha } M \otimes _ R S \times \prod M_{f_ i} \xrightarrow {\beta } \prod (M \otimes _ R S)_{f_ i} \times \prod M_{f_ if_ j} \end{equation}

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