\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: