Using Hollow Instead of Solid Proof Boxes
November 18, 2006
Mark Senn

How can I use hollow instead of solid proof boxes to end a proof?

\usepackage{amssymb}
\sbox{\proofbox}{$\Box$}
lines.

Here is a complete, self-contained example:

\documentclass[cs]{puthesis}

\usepackage{amssymb}
\sbox{\proofbox}{$\Box$}

\begin{document}

\begin{proof}
This is a proof.
\end{proof}

\end{document}