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+\begin{omgroup}[id=sec.differentiable]{Differentiable Functions}
+\begin{module}[id=differentiable]
+\importmodule[continuous]{continuous}
+\symdef{difffunctions}[2]{\mathcal{C}^1(#1,#2)}
+\abbrdef{DiffRR}[2]{\difffunctions\RealNumbers\RealNumbers}
+\begin{definition}
+ A function $\fun{f}\RealNumbers\RealNumbers$ is called {\defin{differentiable}} at
+ $\inset{x}\RealNumbers$, iff for all $\epsilon>0$ there is a $\delta>0$, such that
+ $\rfrac{\absval{f(x)-f(y)}}{\absval{x-y}}<\epsilon$ for all $\absval{x-y}<\delta$.
+\end{definition}
+\end{module}
+\end{omgroup}
+%%% Local Variables:
+%%% mode: LaTeX
+%%% TeX-master: "paper"
+%%% End: