Union with text inside

Question

I would like to create math symbol similar to set Union (big U) where I can insert inside an arbitrary word or symbol (e.g. "foo"). Something along the lines of this solution: Is a cupdot symbol available in amsmath? but with any text instead of dot. Is it possible?

Welcome to TeX.SE. Simply replacing the \cdot with \text{foo} should work. Not sure how good it will look like though as there is not much space in there. — Peter Grill, Feb 01 '18 at 01:15
See e.g. \stackinset from the stackengine package – and probably use it with \bigcup. — Bernard, Feb 01 '18 at 01:37
How many letters might be in the word that should be placed inside the cup (union) symbol? — Mico, Feb 01 '18 at 06:10
Related: https://tex.stackexchange.com/questions/243478/combine-two-symbols-to-one-fully-scalable — Steven B. Segletes, Feb 01 '18 at 11:55

CarLaTeX · Accepted Answer · 2018-02-01T11:47:00.733

3

A possible solution with TikZ:

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz}
\newcommand{\uwithtext}[1]{\DOTSB\mathbin{\text{\tikz{%
    \node (a) {#1};
    \draw[black, rounded corners=1.2ex] 
        ([yshift=-2pt]a.north west) -- (a.south west) -- (a.south east) -- ([yshift=-2pt]a.north east);}}}}

\begin{document}
    \[
    A \uwithtext{a} B \quad 
    X_{A \uwithtext{a} B} \quad 
    A \uwithtext{ab} B \quad 
    X_{A \uwithtext{ab} B} \quad 
    A \uwithtext{abp} B \quad 
    X_{A \uwithtext{abp} B}  
    \]
\end{document}

edited Feb 01 '18 at 11:47

answered Feb 01 '18 at 11:27

CarLaTeX

62,716

To enhance compatibility with the amsmath package, you might want to add \DOTSB at the beginning of \uwithtext. – GuM Feb 01 '18 at 11:44
@GuM Added, thank you! Did I add it in the correct place? – CarLaTeX Feb 01 '18 at 11:47
Yes, it’s in the correct place. You might want to have a look at how, say, the \skull command is implemented in the halloweenmath package (search the code for \newcommand*\skull. – GuM Feb 01 '18 at 17:04
@krokodil You're welcome! Thank you for accepting my answer and please don't eat ducks! :):):):) – CarLaTeX Feb 02 '18 at 05:53

Union with text inside

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