19.2.6.1

\begin{equation} \label{injectives-equation-huge-diagram} \vcenter { \xymatrix{ \bigoplus _{\mathfrak a} \bigoplus _{\varphi \in \mathop{\mathrm{Hom}}\nolimits _ R(\mathfrak a, M)} \mathfrak {a} \ar[r] \ar[d] & M \ar[d] \\ \bigoplus _{\mathfrak a} \bigoplus _{\varphi \in \mathop{\mathrm{Hom}}\nolimits _ R(\mathfrak a, M)} R \ar[r] & \mathbf{M}(M). } } \end{equation}

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