[Tex/LaTex] How to put a circle around an operator

logicmath-operators

For example, I want to put a circle around \land, just like one can put a circle around + by writing \oplus. Is there a general method to do this?

Best Answer

Here's a version combining \land and \bigcirc:

\makeatletter
\newcommand\incircbin
{%
  \mathpalette\@incircbin
}
\newcommand\@incircbin[2]
{%
  \mathbin%
  {%
    \ooalign{\hidewidth$#1#2$\hidewidth\crcr$#1\bigcirc$}%
  }%
}
\newcommand{\oland}{\incircbin{\land}}
\makeatother

It will change size according to math style:

\[a\oland b\frac{a\oland b}{a\oland b^{a\oland b^{a\oland b}}}\]

gives

oland example

Related Solutions

[Tex/LaTex] How to create a new math operator

A simple solution would be to use the \DeclareMathOperator* command from the amsmath package. The unstarred version places sub- and superscript limits to the right of the operator; the starred version places limits above and below the operator when it is in displaystyle.

\DeclareMathOperator*{\concat}{[} will produce the following results:

You could leave it like that, but for me, the displayed version produces a [ symbol that is too small. Using the scalerel package, you could make the symbol the same size as a \sum symbol:

\DeclareMathOperator*{\concat}{\scalerel*{[}{\sum}}, which will produce the following:

Here is a MWE:

\documentclass{article}

\usepackage{amsmath,scalerel}

%\DeclareMathOperator*{\concat}{[}
\DeclareMathOperator*{\concat}{\scalerel*{[}{\sum}}

\begin{document}

\[
\concat_{n=1}^{\infty} a_n
\]

Inline: $\concat_{n=1}^{\infty} a_n$.

\end{document}

Best Answer

Related Solutions

[Tex/LaTex] How to create a new math operator

Related Question