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

theorems foo.splits = foo.split foo.split_asm;

\begin{isabelle}%
\isacommand{lemma}~{"}n*n~=~n~{\isasymLongrightarrow}~n=0~{\isasymor}~n=1{"}\isanewline
\end{isabelle}%
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