doc-src/TutorialI/Misc/document/arith3.tex

fully enclose "\isadigit{...}";
\<^foo> produces "\isactrlfoo ";

%
\begin{isabellebody}%
\def\isabellecontext{arith3}%
\isacommand{lemma}\ {\isachardoublequote}n{\isacharasterisk}n\ {\isacharequal}\ n\ {\isasymLongrightarrow}\ n{\isacharequal}\isadigit{0}\ {\isasymor}\ n{\isacharequal}\isadigit{1}{\isachardoublequote}\isanewline
\end{isabellebody}%
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