Is there a better way to get the symbol produced by V\llap{--}
? I need it in math mode. The symbol is someitmes used to represent volume. The above hack is not the right symbol but something close.
5 Answers
\documentclass{article}
\newcommand{\volume}{{\ooalign{\hfil$V$\hfil\cr\kern0.08em--\hfil\cr}}}
\begin{document}
$\volume(abc)$
\end{document}
A better implementation, where the dash is built as above, but over a phantom V; the real one is added later, so subscripts and superscripts are placed with respect to it.
\documentclass{article}
\usepackage{amsmath}
\makeatletter
\DeclareRobustCommand{\volume}{\text{\volumedash}V}
\newcommand{\volumedash}{%
\makebox[0pt][l]{%
\ooalign{\hfil\hphantom{$\m@th V$}\hfil\cr\kern0.08em--\hfil\cr}%
}%
}
\makeatother
\begin{document}
$d\volume(abc)$
$x^{}_{\volume}$
$\volume_x$
$V_x$
\end{document}
-
There are kerning issues here if you want a subscript, as in
\volume_n
. Also, as a differential,\mathrm{d}\volume
has incorrect spacing. This issue is addressed in a solution to another question. Are there any issues with that solution?– Sandy GJan 10, 2018 at 20:15 -
@SandyG The subscript problem is solved by using a phantom V in the
\ooalign
and a real V afterwards. Thanks for pointing to the weakness of the original macro.– egregJan 10, 2018 at 22:48
I was looking for the same thing, but found it a bit distracting to have the cross extend beyond the lines of the V. I came up with an alternative approach:
\documentclass{article}
\usepackage{graphicx}
\newcommand{\Vol}{\rotatebox[origin=c]{180}{\ensuremath{A}}}
\begin{document}
Let $\Vol$ represent system volume.
\end{document}
Here you go. Inspired by @egreg's answer. You can adjust the position parameters in the code.
\ooalign{$V$\cr\raisebox{0.15em}{\kern0.04em--}\cr}
Another simple alternative using \makebox
command with the same name of @egreg's named \volume
:
\documentclass[a4paper,12pt]{article}
\newcommand{\volume}{\makebox[1pt][l]{$-$}V}
\begin{document}
\[\frac{d\volume(x,y,z)}{dz}\]
\end{document}
This is how to get it on Google Slides:
V\kern-0.8em\raise0.3ex-
Resulting in:
In Google Docs Addon Math equations, many of the commands, in the neat solutions provided here, are not supported: \ooalign, \raisebox, \cr, \hfill. Instead, using a simple \raise and \kern helps. This is not a generic solution that handles sub- and super-scripts. In slides, we normally want a quick solution that can be easily edited locally, and the expressions are small and local to a slide. Playing around with kern and raise can still work for sub- and super-scripts.
-
This doesn't work in (La)TeX. It might work on Google Slides but that's off-topic here.– campaJan 15, 2021 at 18:16
\forall
? Does it fit your requirements?