\documentclass{article} \usepackage{xtheorem} \DeclareInstance{theoremstyle}{example}{std} { pre-skip = 1cm, post-skip = 1cm, body-style = \ttfamily, head-style = \sffamily, post-head-action = \newline, } \newtheorem{plain}{Thm}{Theorem}[section] \newtheorem{plain}{Prop}[Thm]{Proposition} \newtheorem{plain}{Lem}[Thm]{Lemma} \newtheorem{plain}{Cor}[Thm]{Corollary} \newtheorem{definition}{Def}[Thm]{Definition} \newtheorem*{remark}{Rem}{Remark} \newtheorem*{example}{Exam}{Example} \begin{document} \section{First Section} \begin{Def} \emph{My package} is the \textsf{xtheorem} package. \end{Def} \begin{Thm} My package works as advertised. \end{Thm} \begin{Cor}[Achim] It can be used. \end{Cor} \begin{Rem} This is good. \end{Rem} \section{Second Section} \begin{Def} \emph{My package} is the \textsf{xtheorem} package. \end{Def} \begin{Thm} My package works as advertised. \end{Thm} \begin{Cor}[Achim] It can be used. \end{Cor} \begin{Exam}[Frank] An this shows a new style. \end{Exam} \begin{Rem} This is good. \end{Rem} \stop