\everymath{\displaystyle}
+\author{Mart Lubbers}
+\date{\today}
+\title{Model Checking Excercises 1}
+
\begin{document}
+\maketitle
\begin{enumerate}
\item
- $\xymatrix{
- & l_0 & l_1 & l_2 & l_3 & l_5 & l_6 & l_7\\
- l_0\\
- l_1\\
- l_2\\
- l_3\\
- l_5\\
- l_6\\
- l_7
- }$
\item
$\al(crit_0\veebar crit_1)$
\item