12.16.4.1

\begin{equation} \label{homology-equation-hom-into-shift} \mathop{\mathrm{Hom}}\nolimits _{\text{Gr}(\mathcal{A})}(A, B[k]) = \mathop{\mathrm{Hom}}\nolimits _{\text{Gr}(\mathcal{A})}(A[-k], B) \end{equation}

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