I am using beamer for some presentation and when I end the proof with a multi-line equation, I cannot set the positition the \qed
symbol at the end of the last equation line.
\documentclass[10pt]{beamer}
\usetheme{Warsaw}
\usecolortheme{seahorse}
\renewcommand{\qedsymbol}{{\usebeamercolor[fg]{structure}$\blacksquare$}}
\begin{document}
\begin{frame}
\begin{block}{\proofname}
Some text here
\begin{equation}
\begin{cases}
1\\
2\\
3\\
4.
\end{cases}\notag
\end{equation}
\hfill\qedsymbol
\end{block}
\end{frame}
\end{document}