13.11.1.1

\begin{equation} \label{derived-equation-long-exact-cohomology-sequence-D} \xymatrix{ \ldots \ar[r] & H^ i(X) \ar[r]^{H^ i(f)} & H^ i(Y) \ar[r]^{H^ i(g)} & H^ i(Z) \ar[r]^{H^ i(h)} & H^{i + 1}(X) \ar[r] & \ldots } \end{equation}

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