Korrekt.
Code:
\documentclass[11pt]{article}
\begin{document}
\begin{equation}
\textbf{v}(t) = q \tau_n [m_e^{*}]^{-1} \textbf{E}
\qquad\text{ou}\qquad
[m_e^{*}]^{-1} = \left(
\begin{array}{lll} % Streiche »1«, setze »l«
\frac{1}{m_{le}^{*}} & 0 & 0\\
0 & \frac{1}{m_{te}^{*}} & 0\\
0 & 0 & \frac{1}{m_{te}^{*}}
\end{array}
\right),
\end{equation}\end{document}
Leichter.
Code:
\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{mathtools} % lädt »amsmath«
\begin{document}
\begin{equation}
\textbf{v}(t) = q \tau_n [m_e^{*}]^{-1} \textbf{E}
\qquad\text{ou}\qquad
[m_e^{*}]^{-1} =
\begin{pmatrix}
\frac{1}{m_{le}^{*}} & 0 & 0\\
0 & \frac{1}{m_{te}^{*}} & 0\\
0 & 0 & \frac{1}{m_{te}^{*}}
\end{pmatrix}
,
\end{equation}
\end{document}
Thorsten
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