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\section{Randbedingungen im HEZ}  \begin{equation}  Rot\underline{\vec{H}}(\vec{r})=\underline{\vec{J}}_F(\vec{r})  \end{equation}  \begin{equation}  Rot\underline{\vec{E}}(\vec{r})=\vec{r}  \end{equation}  \begin{equation}  Div\underline{\vec{D}}(\vec{r})=\underline{\vec{\rho}}_F(\vec{r})  \end{equation}  \begin{equation}  \underline{\vec{B}}(\vec{r})=0  \end{equation}  \subsection{Elektrische Wand}  \begin{equation}  \underline{\vec{E}}_{tang}=\vec{0}  \end{equation}  \subsection{Magnetische Wand}  \begin{equation}  \underline{\vec{H}}_{tang}=\vec{0}  \end{equation}