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| \documentclass{article}
\usepackage{mdframed,xcolor}
\usepackage{lipsum}
\newcount\defi
\makeatletter
\newenvironment{definition}
{\list{}{\listparindent 1.5em%
\itemindent\listparindent
\rightmargin\leftmargin
\parsep\z@\@plus\p@}%
\item\begin{mdframed}[linewidth=2,
backgroundcolor=black!15,
skipbelow=\baselineskip,
skipabove=\baselineskip]
\advance\defi\@ne
\hrulefill~D\'efintion~\the\defi~\hrulefill\par}
{\par\noindent\hrulefill\par
\end{mdframed}\endlist}
\makeatother
\begin{document}
\lipsum[66]
\begin{definition}
\lipsum[3]
\begin{definition}
\lipsum[4-5]
\end{definition}
\lipsum[2-3]
\end{definition}
\lipsum[66]
\end{document} |
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