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I want to draw a "separating implication" symbol by using Latex.

This is an operator in Separation Logic and it looks like below:

enter image description here

enter image description here

It should be a minus symbol (-) combining with an asterisk (*), but how to remove completely space between them?

I try \mathrel{{-}{*}} but it does not work.

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2 Answers 2

Reset to default
10

Is this okay?

\documentclass{article}
\newcommand\sepimp{\mathrel{-\mkern-6mu*}}
\begin{document}
$P\sepimp Q$
$\scriptstyle P\sepimp Q$
$\scriptscriptstyle P\sepimp Q$
\end{document}

enter image description here

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  • 1
    I would use \mathbin here as this seems to be a binary operator.
    – LaRiFaRi
    Jan 15, 2015 at 8:11
  • Do you mind explaining what \mathrel does? What's the difference between our answers, and why does yours look/work better?
    – Ryan
    Jan 15, 2015 at 8:22
  • @Ryan \mathrel makes the enclosed symbol to behave like a relation when it comes to inserting math glue. \mathbin does the same but makes to argument a binary operator. See also tex.stackexchange.com/a/38984/10995
    – Henri Menke
    Jan 15, 2015 at 9:13
  • @LaRiFaRi: The ordinary implication symbol \to is also a \mathrel, so this makes the spacing consistent.
    – Emil Jeřábek
    Jan 15, 2015 at 14:31
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Quick text version:

\documentclass{article}

\newcommand{\sep}{--\kern-.25em\raisebox{-.62ex}{*}\ }

\begin{document}
    P \sep Q
\end{document

enter image description here

Math mode version:

\newcommand{\sep}{-\kern-.6em\raisebox{-.659ex}{*}\ }

enter image description here

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  • I think it is meant to be a math operator.
    – Henri Menke
    Jan 15, 2015 at 8:13
  • @HenriMenke Yep, just realized that, and edited.
    – Ryan
    Jan 15, 2015 at 8:17

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