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+%%
+%% Der LaTeX-Begleiter, zweite Auflage (September 2005)
+%%
+%% Beispiel 2-4-6 von Seite 77.
+%%
+%% 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{75.26308pt}
+\setlength\textheight{11\baselineskip}
+\sloppy
+\pagestyle{origplain}
+
+\StartShownPreambleCommands
+\usepackage[ngerman]{varioref}
+\usepackage{ifthen}
+\newcommand\veqns[2]{%
+ \vrefpagenum\firstnum{#1}%
+ \vrefpagenum\secondnum{#2}%
+ die Gleichung%
+ \ifthenelse{\equal\firstnum\secondnum}%
+ {en \ref{#1}}%
+ { \ref{#1}\vpageref{#1}}%
+ \space und \ref{#2}\vpageref{#2}}
+\StopShownPreambleCommands
+\begin{document}
+Test: \veqns{A}{B} \par Test: \veqns{A}{C}
+\begin{equation} a=b+c \label{A}\end{equation}
+\begin{equation} b=a+c \label{B}\end{equation}
+\newpage
+Test: \veqns{A}{B} \par Test: \veqns{A}{C}
+\newpage
+\begin{equation} c=a+b \label{C}\end{equation}
+\end{document}