doc-src/TutorialI/Misc/document/fakenat.tex

added eufrak symbols;
renamed \<ll> to \<lless> and \<gg> to \<ggreater>;

%
\begin{isabellebody}%
\def\isabellecontext{fakenat}%
%
\begin{isamarkuptext}%
\noindent
The type \isaindexbold{nat}\index{*0|bold}\index{*Suc|bold} of natural
numbers is predefined and behaves like%
\end{isamarkuptext}%
\isacommand{datatype}\ nat\ {\isacharequal}\ {\isadigit{0}}\ {\isacharbar}\ Suc\ nat\end{isabellebody}%
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