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\newcommand{\rot}{\text{rot}}
...
\begin{equation}
\rot \vec H = \frac{\kappa}{c} \dot{\vec E} + \frac{4\pi}{c} \delta(z) \vec j;
\end{equation}
! Undefined control sequence.
l.46 \rot
\vec H = \frac{\kappa}{c} \dot{\vec E} + \frac{4\pi}{c} \d...🦉K
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