在 Latex 中输入 fbox

Question

在备注句末尾插入像上图所示的小方框的 Latex 代码是什么？

Answer 1

图片的备注是proof的环境amsthm，不需要直接输入\qedsymbol:

\documentclass{article}
\usepackage{lipsum,parskip}
\usepackage{amsthm,amssymb}
\begin{document}

\begin{proof}
This is classwork, straight from the lectures notes.
\end{proof}

\renewcommand\proofname{Remark}

\begin{proof}
This is classwork, straight from the lectures notes.
\end{proof}

\begin{proof}
\lipsum[1][1-5]
\end{proof}

With \qedsymbol\ changed to \renewcommand\qedsymbol{$\boxtimes$}\qedsymbol: 

\begin{proof}[Whatever]
\lipsum[2][1-3]
\end{proof}

\end{document}