I am using
\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\begin{document}
\begin{proof}
A = B
\end{proof}
\end{document}
and an empty square box will be added automatically at the end of the proof. I am wondering how to add a solid black box instead, in an automatic way.
Best Answer
The documentation of amsthm says:
Thus, one might proceed as follows:
A mwe to play with:
If you're looking for beamer, it is quite the same: you have to re-define the template
qed symbol
(almost similar to my previous answer in How to customise (e.g. make thicker) the end-proof symbol in Beamer?).A mwe:
Notice that in this case the symbol will assume the colors of the Beamer color theme currently in use.