[Tex/LaTex] How to typeset “\utimes” (akin to \uplus)

math-modesymbols

What is the easiest way to typeset – in math mode – a symbol similar to \uplus (the symbol for disjoint set union, consisting of a plus embedded inside a union symbol), only with a "times" symbol substituting for the plus?

Best Answer

\uplus appears to have status mathbin, whereas \biguplus appears to have status mathop. The following definitions of \utimes and \bigutimes preserve these settings.

enter image description here

\documentclass{article}
\usepackage{amsmath} %for "\boldsymbol" macro

\newcommand\utimes{\mathbin{\ooalign{$\cup$\cr%
   \hfil\raise0.42ex\hbox{$\scriptscriptstyle\times$}\hfil\cr}}}
\newcommand\bigutimes{\mathop{\ooalign{$\bigcup$\cr%
   \hfil\raise0.36ex\hbox{$\scriptscriptstyle\boldsymbol{\times}$}\hfil\cr}}}

\begin{document}
$a\uplus a$  $a\biguplus a$

$a\utimes a$ $a\bigutimes a$

$\uplus\utimes$

${\biguplus}{\bigutimes}$
\end{document}

The arguments of \raise -- 0.42ex and 0.36ex, resp. -- were chosen to make \uplus and \utimes as similar in layout as possible, for the Computer Modern math font family -- which is the default font family in most TeX distributions (including the screenshot shown above). For other math font families, other arguments of \raise will probably have to be considered.

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