\documentclass{letter}
\usepackage{amsmath}

\begin{document}

\[ \begin{array}{ll}
     \emptyset, & \emptyset \hspace{1em}
     \text{(\ensuremath{\operatorname{for}}\ensuremath{\operatorname{every}})},\\
     \emptyset, & \emptyset \hspace{1em}
     \text{(\ensuremath{\operatorname{for}}\ensuremath{\operatorname{every}})
     .}
   \end{array} \]

\end{document}
