Equation 16.14.8487F3CA23BA4

\begin{equation} \sum _{i,j}a^{i\bar j}\partial _{z_ i}\partial _{\bar z_ j}w=A:D^2w,\qquad A\xi \cdot \xi =\frac14\sum _{i,j}a^{i\bar j}\zeta _ i\bar\zeta _ j, \end{equation}