texmath-0.10: tests/writers/mfenced-04.tex
\left\lceil \begin{matrix}
U \\
V \\
\end{matrix} \right\rfloor = \left\lfloor \begin{matrix}
U \\
V \\
\end{matrix} \right\rceil
\left\lceil \begin{matrix}
U \\
V \\
\end{matrix} \right\rfloor = \left\lfloor \begin{matrix}
U \\
V \\
\end{matrix} \right\rceil