17.28.2.1

\begin{equation} \label{modules-equation-define-module-differentials} \begin{matrix} \mathcal{O}_2[\mathcal{O}_2 \times \mathcal{O}_2] \oplus \mathcal{O}_2[\mathcal{O}_2 \times \mathcal{O}_2] \oplus \mathcal{O}_2[\mathcal{O}_1]
& \longrightarrow
& \mathcal{O}_2[\mathcal{O}_2]
\\ [(a, b)] \oplus [(f, g)] \oplus [h]
& \longmapsto
& [a + b] - [a] - [b] +
\\ & & [fg] - g[f] - f[g] +
\\ & & [\varphi (h)]
\end{matrix} \end{equation}

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