Highlight a postulate with an indicator on the margin

Question

Currently I have a created a postulate environment that works as follows,

\vspace{1em}
\begin{postulate}\label{section:Schrodinger}
    {\bfseries{\textsc{(Schr\"odinger) }}} Time translation is given by, $\rho\mapsto e^{-itH}\rho e^{itH}.$
\end{postulate}
\vspace{1em}

Yields a result,

Now what I want to do is highlight or make the reader focus on this statement by doing some indicator type diagram on the margin as follows,

You can use the leftbar environment from the framed package. I suppose postulate is define as a theorem-like environment? — Bernard, Sep 21 '21 at 19:10
@Bernard Yes it's theorem like environment. Can you elaborate a bit on what I should do? Also I want it to align correctly with the text. If the text is larger it should be correctly sized. Bigger text => Longer indicator on the margin — MrPajeet, Sep 21 '21 at 19:14
Seems like framed and some other package I am using are in conflict — MrPajeet, Sep 21 '21 at 19:23
You can do that either with thmtools or with ntheorem. Could you please post a complete code showing how exactly you defined this environment? — Bernard, Sep 21 '21 at 19:23
@Bernard My sty file is a bit of a clusterfuck. Too many things defined there. I believe this is my definition for postulate. \newtheorem*{postulate}{\textsc{Postulate}}
Would it be possible to do this as a margin note and tikz? — MrPajeet, Sep 21 '21 at 19:33
Related/duplicate(s): Creating a particular environment with a left-side rule; Double vertical bars alongside statements of theorems — Werner, Sep 21 '21 at 19:34
Thank you @Werner but this one seems to be within the text? I wanted to do this in the margin so that it's not uniform like rest of the paper and would draw some attention. — MrPajeet, Sep 21 '21 at 19:36

Hafid Boukhoulda · Accepted Answer · 2021-09-22T15:20:14.123

1

A variant solution which use the tcolorbox package:

\documentclass{article}
\usepackage{lipsum}
\usepackage[theorems,skins]{tcolorbox}
\newtcbtheorem{postulate}{Postulate}{
description delimiters parenthesis,
separator sign ={.},
coltitle=black,
colback=white,
fontupper=\itshape,
fonttitle=\upshape\bfseries,
attach title to upper={\ },
empty,
left*=0pt,
right*=0pt,
boxsep=0pt,
top=1em,
bottom=1em,
borderline west={2mm}{-5mm}{blue} 
}{section}
\begin{document}
\lipsum[1]
\begin{postulate} {Heisenberg} 
   Time translation is given by, $\rho\mapsto e^{-itH}\rho e^{itH}.$
   \lipsum[1]
\end{postulate}
\lipsum[2]
\begin{postulate} {Schr&quot;odinger}{Schrodinger}
   Time translation is given by, $\rho\mapsto e^{-itH}\rho e^{itH}.$
   \lipsum[2]
\end{postulate}
\textcolor{red}{See} the postulate \ref{section:Schrodinger}
\end{document}

edited Sep 22 '21 at 15:20

answered Sep 22 '21 at 15:12

Hafid Boukhoulda

8,563

Why is this causing a conflict? Possibly with the package amsthm – MrPajeet Sep 22 '21 at 16:20
@Boltzee What conflict ? – Hafid Boukhoulda Sep 22 '21 at 17:29
1

It was having some conflict with \label but that was fine. Thanks a lot! – MrPajeet Sep 22 '21 at 22:08

score 0 · Answer 2 · answered Sep 21 '21 at 20:23

Is that what You wanted? If not visit this one

\documentclass{article}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage{mathtools}
\usepackage{lipsum}
\usepackage[framemethod=tikz]{mdframed}
% As I am working with transparency here, you should define darker colors.
\definecolor{colorBackground}{HTML}{F5F5F5} % Grey 500
\definecolor{colorDefinition}{HTML}{4CAF50} % Green 500
\definecolor{colorNotiz}{HTML}{81D4FA}      % Light Blue 200
\mdfdefinestyle{box}{
    topline=false,
    bottomline=false,
    rightline=false,
    linewidth=4pt,
    backgroundcolor=none,
    apptotikzsetting={\tikzset{mdfbackground/.append style={fill=gray!45,fill opacity=.6}}},
    frametitlefont=\sffamily\bfseries\color{black},
    splittopskip=.5cm,
    frametitlebelowskip=0.0cm,
}
% Definition
\mdtheorem[style=box,linecolor=colorDefinition]{Def}{Postulate}
\begin{document}
\begin{Def}
$$\rho\mapsto e^{-itH}\rho e^{itH}.$$
\end{Def}
\end{document}

Thank you for your response, what I am trying to do is a blue-green line in the margin not within the text — MrPajeet, Sep 21 '21 at 20:35

Highlight a postulate with an indicator on the margin

2 Answers2