Stuff
public text v1 · immutable\documentclass[a4paper,12pt]{article}
\begin{document}
\begin{equation}
\begin{pmatrix}
xy \\
z \& v
\end{pmatrix}
\end{equation}
\end{document}\documentclass[a4paper,12pt]{article}
\begin{document}
\begin{equation}
\begin{pmatrix}
xy \\
z \& v
\end{pmatrix}
\end{equation}
\end{document}