\begin{isabelle}% \isacommand{lemma}~{"}{\isasymlbrakk}~{\isasymnot}~m~<~n;~m~<~n+1~{\isasymrbrakk}~{\isasymLongrightarrow}~m~=~n{"}\isanewline \end{isabelle}% %%% Local Variables: %%% mode: latex %%% TeX-master: "root" %%% End: