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%%
%% Der LaTeX-Begleiter, zweite Auflage (September 2005)
%%
%% Beispiel 8-2-12 von Seite 487.
%%
%% Copyright (C) 2005 Frank Mittelbach, Michel Goossens,
%% Johannes Braams, David Carlisle, and Chris Rowley
%%
%% Uebersetzung: Copyright (C) 2005 Claudia Krysztofiak,
%% Rebecca Stiels und Frank Mittelbach
%%
%% 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.
%%
\documentclass{lb2examargin}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{190.23712pt}
\StartShownPreambleCommands
\usepackage{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{gather}
D(a,r) \equiv \{ z \in \mathbf{C}
\colon |z - a| < r \} \notag \\
\operatorname{seg} (a, r) \equiv
\{ z \in \mathbf{C} \colon
\Im z < \Im a, \ |z - a| < r \} \\
C (E, \theta, r) \equiv
\bigcup_{e \in E} c (e, \theta, r)
\end{gather}
\end{document}
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