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+\begin{omgroup}[id=sec.reals]{Real Numbers}
+\begin{module}[id=reals]
+\symdef{RealNumbers}{\mathbb{R}}
+\symdef{absval}[1]{\mixfixi[p=2000]|{#1}|}
+\symdef{rfrac}[2]{\frac{#1}{#2}}
+
+\begin{definition}[id=reals.def]
+ We denote the set of {\defii{real}{numbers}} we all know and love with
+ $\RealNumbers$.
+\end{definition}
+
+\begin{definition}[id=absval.def]
+ The absolute value $\absval{r}$ of a real number $r$.
+\end{definition}
+\end{module}
+\end{omgroup}
+%%% Local Variables:
+%%% mode: LaTeX
+%%% TeX-master: "all"
+%%% End: