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+%%
+%% Der LaTeX-Begleiter, zweite Auflage (September 2005)
+%%
+%% Beispiel 8-6-3 von Seite 514.
+%%
+%% 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{lb2exa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{154.23712pt}
+
+\StartShownPreambleCommands
+\usepackage[fleqn]{amsmath}
+\DeclareMathOperator \meas {meas}
+\DeclareMathOperator*\esssup {ess \, sup}
+\DeclareMathOperator*\supminus{sup - minus*}
+\newcommand\abs [1]{\lvert#1\rvert}
+\newcommand\norm[1]{\lVert#1\rVert}
+\StopShownPreambleCommands
+\begin{document}
+\begin{gather*}
+ \norm{f}_\infty = \esssup_{x\in R^n} \abs{f(x)} \\
+ \meas_1 \{u \in R_+^1 \colon f^*(u)>\alpha \} = \\
+ \quad \esssup_{x \in R^i} \; \meas_i
+ \{u \in R^n \colon \abs{f(u)} \geq \alpha \} \\
+ \quad (\forall \alpha \in \supminus_{f^*} R_{*+})
+\end{gather*}
+\end{document}