109.63.0.1

\begin{equation} \label{examples-equation-commutes-up-to-homotopy} \vcenter { \xymatrix{ A^\bullet \ar[d]_{1 + \epsilon } \ar[r] & B^\bullet \ar[r] \ar[d]_1 & C^\bullet \ar[d]_1 \\ A^\bullet \ar[r] & B^\bullet \ar[r] & C^\bullet } } \end{equation}

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