doc-src/TutorialI/Misc/document/arith4.tex

begin_theory: store *copy* of initial theory;

\begin{isabelle}%
\isacommand{lemma}~{"}{\isasymnot}~m~<~n~{\isasymand}~m~<~n+1~{\isasymLongrightarrow}~m~=~n{"}\isanewline
\end{isabelle}%
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