%% %% Ein Beispiel der DANTE-Edition %% Mathematiksatz mit LaTeX %% 3. Auflage %% Beispiel 09-11-2 auf Seite 182. %% Copyright (C) 2018 Herbert Voss %% %% It may be distributed and/or modified under the conditions %% of the LaTeX Project Public License, either version 1.3 %% of this license or (at your option) any later version. %% See http://www.latex-project.org/lppl.txt for details. %% %% ==== % Show page(s) 1 %% %% \documentclass[10pt]{screxa} \pagestyle{empty} \setlength\textwidth{352.81416pt} \AtBeginDocument{\setlength\parindent{0pt}} \setcounter{equation}{3} \renewcommand\theequation{9.\arabic{equation}} %StartShownPreambleCommands \usepackage{cases} %StopShownPreambleCommands \begin{document} \begin{subnumcases}{\label{w} w\equiv} 0 & $c = d = 0$\label{wzero}\\ \sqrt{|c|}\,\sqrt{\frac{1 + \sqrt{1+(d/c)^2}}{2}} & $|c| \geq |d|$ \\ \sqrt{|d|}\,\sqrt{\frac{|c/d| + \sqrt{1+(c/d)^2}}{2}} & $|c| < |d|$ \end{subnumcases} \begin{subnumcases}{\sqrt{c+id}=} 0 & $w=0$ (case \ref{wzero}) \\ w+i\frac{d}{2w} & $w \neq 0$, $c \geq 0$ \\ \frac{|d|}{2w} + iw \qquad & $w \neq 0$, $c < 0$, $d \geq 0$\\ \frac{|d|}{2w} - iw \qquad & $w \neq 0$, $c < 0$, $d < 0$ \end{subnumcases} \end{document}