GT56ka

Written on June 24, 2019
\newtheorem{thm}{Théorème}
\newtheorem{coro}[thm]{Corollaire}

\begin{thm}       texte. \end{thm}
\begin{coro}[Xyz] texte. \end{coro}
\begin{thm}       texte. \end{thm}