6

I'm doing some CS theory papers and need to use a monus operator.

Picture below:

enter image description here

What package should I use to be able to use it? I've Google'd, but nothing came up.

Thanks for the help.

  • possible duplicate of How to look up a symbol or identify a math alphabet? – Werner Dec 1 '13 at 1:28
  • @Werner Any idea why Detexify2 fails to solve this? Even after repeated tries? – Masroor Dec 1 '13 at 1:37
  • @MMA: I tried as well, but the symbol is available in the Comprehensive LaTeX Symbol List (and therefore a duplicate). It may be a very low sought-after symbol, and Detexify can be trained to recognize symbols once it's found. Minimal training -> low recognition, perhaps. – Werner Dec 1 '13 at 1:39
  • @Werner I also had to look up CLST when Detexify2 failed. Just wondering why it failed, I recommend it to other people often. – Masroor Dec 1 '13 at 1:40
  • 1
    To the voters for closing: there are \dotdiv or \dotminus in the list of symbols, but they don't solve the problem. Closing as a duplicate of "how to look up" is meaningful only if the symbol is available without any special package that might change the appearance of all symbols. – egreg Dec 1 '13 at 10:29
4

This is obsession!

\documentclass{article}
\usepackage{tikz,amsmath}
\newcommand{\Monus}{%
  \mathop{%
  \text{%
  \begin{tikzpicture}
  \fill (0,1ex) circle (0.75ex);
  \draw[thick] (-3ex,-.5ex) -- (3ex,-.5ex);
  \end{tikzpicture}%
}
}
}
\begin{document}
 $A \Monus B_{\Monus B}$
\end{document}

enter image description here

5

Keeping this up for visibility since there doesn't seem to be any similar question on StackExchange.

Use \dotdiv from package mathabx.

5

While \dotdiv from mathabx could be used (see Importing a Single Symbol From a Different Font), it would waste a math family.

Here's a way without any package other than amsmath.

\documentclass{article}
\usepackage{amsmath}

\providecommand{\dotdiv}{% Don't redefine it if available
  \mathbin{% We want a binary operation
    \vphantom{+}% The same height as a plus or minus
    \text{% Change size in sub/superscripts
      \mathsurround=0pt % To be on the safe side
      \ooalign{% Superimpose the two symbols
        \noalign{\kern-.35ex}% but the dot is raised a bit
        \hidewidth$\smash{\cdot}$\hidewidth\cr % Dot
        \noalign{\kern.35ex}% Backup for vertical alignment
        $-$\cr % Minus
      }%
    }%
  }%
}

\begin{document}
$a-b\dotdiv c_{\dotdiv}$
\end{document}

enter image description here

  • 1
    how does this differ from \dotdiv or \dotminus or unicode U+2238? if it is really different, and a published reference can be cited, i will be happy to submit it for unicode consideration. – barbara beeton Dec 1 '13 at 15:10
  • @barbarabeeton I don't think it differs from those symbols. It's just the usual problem that loading mathabx has the known side effects. – egreg Dec 1 '13 at 16:51

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.