doc-src/TutorialI/Misc/document/arith1.tex

part of set-up

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\begin{isabellebody}%
\def\isabellecontext{arith{\isadigit{1}}}%
\isacommand{lemma}\ {\isachardoublequote}{\isasymlbrakk}\ {\isasymnot}\ m\ {\isacharless}\ n{\isacharsemicolon}\ m\ {\isacharless}\ n{\isacharplus}{\isadigit{1}}\ {\isasymrbrakk}\ {\isasymLongrightarrow}\ m\ {\isacharequal}\ n{\isachardoublequote}\isanewline
\end{isabellebody}%
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