fox
\end{theorem}
+ \begin{exercise}
+ jumps
+ \end{exercise}
+
\begin{definition}
quod
\end{definition}
fox
\end{theorem*}
+ \begin{exercise*}
+ jumps
+ \end{exercise*}
+
\begin{definition*}
quod
\end{definition*}
\theoremstyle{plain}
\newtheorem*{corollary*}{Corollary}
+\newtheorem*{exercise*}{Exercise}
\newtheorem*{lemma*}{Lemma}
\newtheorem*{proposition*}{Proposition}
\newtheorem*{theorem*}{Theorem}
\theoremstyle{plain}
\newtheorem{corollary}{Corollary}
+\newtheorem{exercise}{Exercise}
\newtheorem{lemma}{Lemma}
\newtheorem{proposition}{Proposition}
\newtheorem{theorem}{Theorem}