20.23.6.2

\begin{equation} \label{cohomology-equation-second-homotopy} h(s)_{i_0 \ldots i_ p} = \left\{ \begin{matrix} 0
& \text{if}
& i_0 < i_1 < \ldots < i_ p
\\ (-1)^ a s_{i_0 \ldots i_{a - 1} i_ a i_ a i_{a + 1} \ldots i_ p}
& \text{if}
& i_0 < i_1 < \ldots < i_{a - 1} < i_ a = i_{a + 1}
\end{matrix} \right. \end{equation}

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