# Circled not equal sign

How can I create a circled not equal sign similar to the image below?

• Welcome! \documentclass{article} \usepackage{circledsteps} \begin{document} $E\Circled{\ne}m\,c^3$ \end{document} ?
– user194703
Jan 30 '20 at 15:22

Here is a solution with a smaller \not bar, so the symbol is completely enclosed in the circle without the circle being too large.

Edit: I added another solution. The \circneqrel command provides a circled \neq symbol which is spaced as a binary relation symbol, considering the circle as the limits of the symbol (this is the first solution I posted). The \circneq command provides a similar symbol, but adjusting the spacing as if it was a simple \neq symbol.

\documentclass{article}
\usepackage{trimclip}
\newcommand{\newneq}{\clipbox{0pt 1.5pt 0pt 1.5pt}{$\neq$}}
\newlength{\bigcirclength}
\newlength{\neqlength}
\settowidth{\bigcirclength}{$\bigcirc$}
\settowidth{\neqlength}{$\neq$}
\newcommand{\circneqrel}{\mathrel{\makebox{$\bigcirc$\hspace*{-\bigcirclength}\makebox[\bigcirclength]{\newneq}}}}
\newcommand{\circneq}{\mathrel{\makebox{\makebox[\neqlength]{$\bigcirc$}\hspace*{-\neqlength}$\newneq$}}}
\begin{document}
$$E \circneqrel mc^3$$

$$E \circneq mc^3$$

$$E \neq mc^3$$
\end{document}


While one may quibble about the small overlap, this approach has two advantages: 1) the spacing of \necirc is the same as that of \ne and 2) it works across math styles.

\documentclass{article}
\usepackage{stackengine,scalerel}
\newcommand\necirc{\mathrel{\ThisStyle{\ensurestackMath{%
\stackengine{0pt}{\SavedStyle\ne}{\SavedStyle\bigcirc}{O}{c}{F}{T}{L}}}}}
\begin{document}
$E\ne mc^3$

$E \necirc mc^3$

$\scriptstyle E\ne mc^3$

$\scriptstyle E \necirc mc^3$

$\scriptscriptstyle E\ne mc^3$

$\scriptscriptstyle E \necirc mc^3$
\end{document}


Here are two solutions: one with \stackinset command from the stackengine package, with \bigcirc and a slightly reduced version of \neq, and another with the recent package circledsteps:

\documentclass{article}
\usepackage{graphicx}
\usepackage{stackengine}
\usepackage{circledsteps}

\newcommand{\circledneq}{\mathrel{\stackMath\stackinset{c}{0pt}{c}{0pt}{\scalebox{0.75}{$\neq$}}{\bigcirc}}}
\newcommand{\Circledneq}{\pgfkeys{/csteps/inner ysep=2.5pt, /csteps/inner xsep=2.5pt}\mathrel{\Circled{\neq}} }

\begin{document}

$E\circledneq mc^3$

$E\Circledneq mc^3$

\end{document}


This is only a simple solution using simple commands where I have used a predefinite symbol of the stix package called \circledequal.

%% Compile and read me!
\documentclass[12pt]{article}
\usepackage{stix,cancel}
\begin{document}
$A \cancel{\circledequal} B, A_{\cancel{\circledequal}} B$
\end{document}


Addendum: With fdsymbol package you have the same font of Computer Modern (CM).

\documentclass[a4paper,12pt]{article}
\usepackage{cancel,fdsymbol}
\begin{document}
$A\cancel{\oequal} B$
\end{document}