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\begin{isabelle}%
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\isacommand{lemma}~{"}n*n~=~n~{\isasymLongrightarrow}~n=0~{\isasymor}~n=1{"}\isanewline
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\end{isabelle}%
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%%% Local Variables:
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%%% mode: latex
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%%% TeX-master: "root"
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%%% End: