-\theoremstyle{plain}
+\theoremstyle{nonumberplain}
\theoremheaderfont{\normalfont\sc}
\theorembodyfont{\slshape}
-\theoremsymbol{$\dagger$}
+\theoremsymbol{}
\theoremprework{\medskip}
%\theorempostwork{}
\theoremseparator{. }
-\newtheorem{Proof}{Preuve}%[chapter]
+\newtheorem{Proof}{Preuve}%[]
\theoremstyle{plain}
\newtheorem{Exo}{Exercice}[chapter]
+
+
\theoremstyle{plain}
%\theoremsymbol{\ensuremath{\clubsuit}}
\theoremseparator{.}