5

I am looking for this symbol:

image

I recently discovered it in a paper. However, I was not able to find it in the "Comprehensive List" (symbols-a4.pdf) or anywhere else.

egreg
  • 1,121,712
user1658887
  • 391

5 Answers5

8

This could be what you're looking for:

\newcommand{\todot}{%
  \mathrel{\ooalign{\hfil$\vcenter{
    \hbox{$\scriptscriptstyle\bullet$}}$\hfil\cr$\to$\cr}
  }%
}
\newcommand{\longtodot}{%
  \mathrel{\ooalign{\hfil$\vcenter{
   \hbox{$\mkern6mu\scriptscriptstyle\bullet$}}$\hfil\cr$\longrightarrow$\cr}
  }%
}

enter image description here

egreg
  • 1,121,712
  • Looks great! This gives me an idea on how to achieve it. Thanks! – user1658887 Sep 29 '12 at 23:49
  • I know this is a really old answer, but if someone wants to use this and finds the spacing around the operator a bit big, you can replace \mathrel with \mathbin, which seems to give it the same spacing as \to. – N. Virgo May 06 '21 at 00:46
4

I've never seen this symbol, but you can easily build one very similar. This is my approach in text mode: MWE

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{ifsym}
\newcommand{\arrowdot}{\rule[0.5ex]{2em}{0.1em}%
\hspace{-1em}\textbullet{}%
\raisebox{-.2em}{\textifsymbol[ifgeo]{116}}
}
\newcommand{\arrowdotdot}{\rule[0.5ex]{2em}{0.1em}%
\hspace{-1.5em}\textbullet{}\textbullet{}%
\raisebox{-.2em}{\textifsymbol[ifgeo]{116}}
}


\begin{document}

\textbackslash{\tt arrowdot~~~} \arrowdot

\textbackslash{\tt arrowdotdot} \arrowdotdot
\vspace{3ex}

Subway \arrowdot Airport \arrowdotdot Railway

\end{document}
Fran
  • 80,769
2

You can also use the usual overkill option of tikz which then gives you all the flexibility inherent in tikz. Here are a few of the possible options where you can easily control the location of the dot (pos=<percent>), arrow length (x=<length>), arrow type, and color:

enter image description here

Further Enhancements

  • If desired this could be enhanced to provide separate draw options for the arrow and the dot.

Code:

\documentclass{article}
\usepackage{calc}
\usepackage{tikz}

\newcommand{\arrowdot}[1][]{% #1 = optional draw paramaters (applies to both arrow and dot)
    \mathrel{%
        \tikz [x=0.75cm, y=\heightof{\strut}, line width=.2ex, ->, baseline, #1] 
            \draw (0,0.4) -- (1,0.4) 
            node [pos=0.4,shape=circle, fill=black, draw, inner sep=1pt, #1] {};
    }%
}%


\begin{document}
    $A \arrowdot B$


$A \arrowdot[pos=0.5, -latex, x=1.2cm] B$

$A \arrowdot[pos=0.6,red,-&gt;] B$

$A \arrowdot[pos=0.2,blue, -stealth] B$



\end{document}
Community
  • 1
Peter Grill
  • 223,288
1

If you are looking for any symbol, you can find it on this pattern recognition machine! It is really awesome!!!

You can find it here

Just draw your symbol on the white window and voila!!!

Thanos
  • 12,446
0

The chemfig manual have also an interesting example of arrows with dots:

MWE

\documentclass{article}
\usepackage{chemfig}
\begin{document}

% Example from chemfig manual, page 58
% http://mirrors.ctan.org/macros/generic/chemfig/chemfig_doc_en.pdf

\makeatletter
\definearrow4{-.>}{%
\edef\pt@radius{\ifx\@empty#4\@empty 2pt\else #4\fi}% dot radius
\CF@arrow@shift@nodes{#3}%
\expandafter\draw\expandafter[\CF@arrow@current@style,-CF@full](\CF@arrow@start@node)--(\CF@arrow@end@node)
coordinate[midway](mid@point);
\filldraw(mid@point)circle(\pt@radius);%
\CF@arrow@display@label{#1}{0.5}{+}{\CF@arrow@start@node}{#2}{0.5}{-}{\CF@arrow@end@node}
}
\makeatother


\schemestart
A \arrow{-.>} B \arrow{-.>[above][below][][1pt]} C \arrow{-.>[][below]}[30] D \arrow{-.>[above][][5pt][1.5pt]} E
\schemestop

\end{document}
Fran
  • 80,769