Page Layout ⇒ How to edit the 'proof' environment

[Plato]

Code: Select all

%Preamble
\documentclass[11pt,a4paper,openany]{book}
\usepackage{amssymb,amsmath,amsthm}
\usepackage[dutch]{babel}
\usepackage{mdframed}
\usepackage{lipsum}
\renewcommand{\qedsymbol}{$\blacksquare$}
\pagestyle{plain}
\setlength{\parindent}{0cm}
\setlength{\parskip}{0cm}
\theoremstyle{definition}
\newmdtheoremenv[linewidth=1.0pt,linecolor=red]{Definition}{Definitie}
\newmdtheoremenv[linewidth=1.0pt,linecolor=black]{Theorem}{Theorema}
\newtheorem{corollary}{Corollarium}

\begin{document}
\begin{titlepage}

Hey guys, I'm writing a mathematical text and I wish to change the 'proof' environment a little bit. Now, I usually do:
\begin{proof}
...
\end{proof}
And the 'proof' comes up in Italics. However, I wish it to be in capital letters + underlined, so that it becomes clearer for the reader. Is there any way to do this, so that it automatically comes up?

Any help would be appreciated, thanks in advance.

[Johannes_B]

You can patch the internals of package amsthm. I used small caps in the example. Uppercase and underlined will look really really ugly.
Have confidence in the reader, they will note it even if \proofname is not printed in red bold faced letters.

Code: Select all

%Preamble
\documentclass[11pt,a4paper,openany]{book}
\usepackage{%amssymb,
amsmath,
amsthm
}
\usepackage[dutch]{babel}
%\usepackage{mdframed}
%\usepackage{lipsum}
%\renewcommand{\qedsymbol}{$\blacksquare$}
%\pagestyle{plain}
%\setlength{\parindent}{0cm}
%\setlength{\parskip}{0cm}
%\theoremstyle{definition}
%\newmdtheoremenv[linewidth=1.0pt,linecolor=red]{Definition}{Definitie}
%\newmdtheoremenv[linewidth=1.0pt,linecolor=black]{Theorem}{Theorema}
%\newtheorem{corollary}{Corollarium}
\usepackage{blindtext}
\newcommand{\prooffont}{\scshape}
\usepackage{xpatch}
\tracingpatches
\xpatchcmd{\proof}{\itshape}{\prooffont}{}{}
\begin{document}
\begin{proof}
	\blindtext
\end{proof}
\end{document}