去掉指定證明模組中的小方框。在\begin{proof}之後加上\renewcommand{\qedsymbol}{}即可。

\documentclass{article}  
\usepackage{amsthm}  
\begin{document}  
\begin{proof}  
This has the QED symbol.  
\end{proof}  
\begin{proof}\renewcommand{\qedsymbol}{}
This hasn't.  
\end{proof}  
\begin{proof}  
And this has it again.  
\end
 
{proof}  
\end{document}  

去掉整個論文的中證明後面的小方框，在論文開始部分加入\renewcommand{\qedsymbol}{}

\documentclass{article}  
\usepackage{amsthm}  
\begin{document}  
\renewcommand{\qedsymbol}{}
\begin{proof}  
This has the QED symbol.  
\end{proof}  
\begin{proof}
This hasn't.  
\end{proof}  
\begin{proof}  
And this has it again.
 
  
\end{proof}  
\end{document}