Hi,
the task is as follows:
I now have to show the following
$$\begin{align*}
\langle f , \Delta g \rangle &= \langle \Delta f , g \rangle\\
\int_{V} dx^3 \overline{f(x)} \cdot \Delta g&= \int_{V} dx^3 \overline{\Delta} \overline{f(x)} \cdot g\\
\int_{V} dx^3 \overline{f(x)} \cdot...