Page Layout ⇒ Add different "QED" like symbols.

[lucia_]

Hi,

I am writing an essay which has different math environments e.g. theorems, lemmas, proofs, etc.

At the end of the proofs, I have the default white square.
I wanted to add symbols at the end of definitions, examples, and remarks as well. I found this solution online, which I've added to my preamble:

Code: Select all

\theoremstyle{definition}
\newtheorem{definitionx}{Definition}[chapter]
\newtheorem{examplex}[definitionx]{Example}
\newtheorem{remarkx}[definitionx]{Remark}

\newenvironment{example}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\lrcorner_E$}\examplex}
  {\popQED\endexamplex}
  
 \newenvironment{remark}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\lrcorner_R$}\remarkx}
  {\popQED\endremarkx}
  
  \newenvironment{definition}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\lrcorner_D$}\definitionx}
  {\popQED\enddefinitionx}

The only problem is that I've noticed that when I have a proof environment inside of a remark environment, the white square at the end of the proof is changing to the remark symbol: $\lrcorner_R$

Anyone know how I can fix this?

[Stefan Kottwitz]

Hi Lucia,

which theorem package are you using? There are several (amsthm, ntheorem, and more).

Stefan

[lucia_]

Hi Stefan,

I am using amsthm.

Lucia

[Stefan Kottwitz]

Here is an example for our members that shows what happens. That's for the forum helpers to easily test by a click on "Run LaTeX here".

Code: Select all

\documentclass{report}
\usepackage{amsthm}
\usepackage{amssymb}
\theoremstyle{definition}
\newtheorem{definitionx}{Definition}[chapter]
\newtheorem{examplex}[definitionx]{Example}
\newtheorem{remarkx}[definitionx]{Remark}

\newenvironment{example}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\lrcorner_E$}\examplex}
  {\popQED\endexamplex}
  
 \newenvironment{remark}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\lrcorner_R$}\remarkx}
  {\popQED\endremarkx}
  
  \newenvironment{definition}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\lrcorner_D$}\definitionx}
  {\popQED\enddefinitionx}
\begin{document}
\begin{remark}
This is a remark.
\begin{proof}
This is a proof.
\end{proof}
\end{remark}
\end{document}

Stefan

[rais]

This should bring the square back for a proof even inside another definition-like environment, where a different qed symbol is used:

Code: Select all

\documentclass{report}
\usepackage{amsthm}
\usepackage{amssymb}
\theoremstyle{definition}
\newtheorem{definitionx}{Definition}[chapter]
\newtheorem{examplex}[definitionx]{Example}
\newtheorem{remarkx}[definitionx]{Remark}

\newenvironment{example}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\lrcorner_E$}\examplex}
  {\popQED\endexamplex}
  
 \newenvironment{remark}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\lrcorner_R$}\remarkx}
  {\popQED\endremarkx}
  
  \newenvironment{definition}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\lrcorner_D$}\definitionx}
  {\popQED\enddefinitionx}

\makeatletter
\renewenvironment{proof}[1][\proofname]{\par
  \pushQED{\qed}%
  \renewcommand\qedsymbol{\openbox}%<--
  \normalfont \topsep6\p@\@plus6\p@\relax
  \trivlist
  \item[\hskip\labelsep
        \itshape
    #1\@addpunct{.}]\ignorespaces
}{%
  \popQED\endtrivlist\@endpefalse
}
\makeatother
\begin{document}
\begin{remark}
This is a remark.
\begin{proof}
This is a proof.
\end{proof}
\end{remark}
\end{document}

KR
Rainer

[lucia_]

Amazing! Thank you :)