[Tex/LaTex] How to add a cross-out “/” to any latex symbol?

math-moderelation-symbolssymbols

I want to type something like this

How to add a / in a latex symbol in general? Like the \nexists, \notin.

Best Answer

There are many possible ways, here are three of them:

a simple \not,
\cancel,
or a TikZy strike out.

Some people would call TikZ overkill, others just very flexible, in the end it is up to you to decide.

\documentclass{article}
\usepackage{cancel}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{tikzmark,shapes.misc}
\begin{document}
$\in$ $\not\in$ $\cancel\in$ $\tikzmarknode[strike out,draw]{1}{\in}$

$B$ $\not B$ $\cancel{B}$ $\tikzmarknode[strike out,draw]{2}{B}$
\end{document}

As you can see, \not works only well for selected symbols. \cancel is arguably nicer but also not too easy to customize. Personally I would say that loading TikZ only for that might be too much, but if you are thinking of using it anyway, this might be a more flexible alternative to the more traditional approaches.

Related Solutions

[Tex/LaTex] How to typeset the ground symbol ⏚ in LaTeX

One option is to define a command for this symbol taking it, for example, from the circuits.ee.IEC library (I wasn't sure if this symbol should be ord, rel, bin, so I opted for bin; also, there was no information about size or baseline position, but all these attributes can easily be adjusted):

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{circuits.ee.IEC}

\newcommand\Ground{%
\mathbin{\text{\begin{tikzpicture}[circuit ee IEC,yscale=0.6,xscale=0.5]
\draw (0,2ex) to (0,0) node[ground,rotate=-90,xshift=.65ex] {};
\end{tikzpicture}}}%
}

\begin{document}

$L\Ground {}$

\end{document}

enter image description here

Another option: this is listed as Unicode character 'EARTH GROUND' (U+23DA), so you could use XeLaTeX and a font supporting the symbol:

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Symbola}

\begin{document}
The earth ground symbol $⏚$.
\end{document}

enter image description here

fileformat.info has a list of possible fonts supporting the symbol.

[Tex/LaTex] How to get this Mathematical Symbol in Latex

Something like this?

\documentclass{article}
\usepackage{amssymb}
\begin{document}
\[
 \not\gtrless
\]
\end{document}