15.67.0.2

\begin{equation} \label{more-algebra-equation-second-ss-ext} E_1^{i, j} = \mathop{\mathrm{Ext}}\nolimits _ R^ j(M, K^ i) \Rightarrow \mathop{\mathrm{Ext}}\nolimits _ R^{i + j}(M, K) \end{equation}

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