ponte-vecchio · July 10, 2022 06:23
diff --git a/boxed_theorem_heading.tex b/boxed_theorem_heading.tex
 \documentclass{article}
 \usepackage{amsthm}
 \usepackage{mathpazo}
 \catcode`@=11
 % Define a custom theorem style
 \newtheoremstyle{custom}{3pt}{3pt}{\rmfamily}{}{\scshape}{}{.5em}{}

 % Redefine thmhead
 % `fbox` is the key macro here.
 % Alternatives include `fcolorbox` if you want coloured box around the heading.
 \def\thmhead#1#2#3{%
 	\fbox{%
 		\thmname{#1}~%
 		\thmnumber{\@ifnotempty{#1}{}\@upn{#2}}~%
 		\thmnote{{\the\thm@notefont (#3)}}%
 	}%
 }

 % Apply the new theorem style to a new theorem definition
 \theoremstyle{custom}
 \newtheorem{theorem}{Theorem}
 \catcode`@=12

 \begin{document}
 \section{Some Section}
 \begin{theorem}[Euler]
 	We have $e^{i\pi}=0$.
 \end{theorem}

 \begin{theorem}[Ferm\'at]
 	We do not have $e^{i\pi}=0$.
 \end{theorem}

 \begin{theorem}[Chernik\'off]
 	Do we have $e^{i\pi}=0$?
 \end{theorem}

 \end{document}
	\documentclass{article}
	\usepackage{amsthm}
	\usepackage{mathpazo}
	\catcode`@=11
	% Define a custom theorem style
	\newtheoremstyle{custom}{3pt}{3pt}{\rmfamily}{}{\scshape}{}{.5em}{}

	% Redefine thmhead
	% `fbox` is the key macro here.
	% Alternatives include `fcolorbox` if you want coloured box around the heading.
	\def\thmhead#1#2#3{%
	\fbox{%
	\thmname{#1}~%
	\thmnumber{\@ifnotempty{#1}{}\@upn{#2}}~%
	\thmnote{{\the\thm@notefont (#3)}}%
	}%
	}

	% Apply the new theorem style to a new theorem definition
	\theoremstyle{custom}
	\newtheorem{theorem}{Theorem}
	\catcode`@=12

	\begin{document}
	\section{Some Section}
	\begin{theorem}[Euler]
	We have $e^{i\pi}=0$.
	\end{theorem}

	\begin{theorem}[Ferm\'at]
	We do not have $e^{i\pi}=0$.
	\end{theorem}

	\begin{theorem}[Chernik\'off]
	Do we have $e^{i\pi}=0$?
	\end{theorem}

	\end{document}
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