Equation 5.28.1C87F0ACE9C76

\begin{equation} (\theta +\mathrm{dd}^{\mathrm{c}}u)^ k :=\sum _{j=0}^ k\binom {k}{j}(\mathrm{dd}^{\mathrm{c}}p)^ j\wedge \beta ^{k-j}. \end{equation}