0

Sometimes I need to make a union with a long subscript specifier at the bottom like so:

\documentclass{article}
\begin{document}
  \begin{equation*}
    \bigcup_{a \in \{\text{set that is very wide}\}} S_a
  \end{equation*}
\end{document}

The problem is that this produces: enter image description here

How do I move the S_a over to the left?

0

You can use the \smashoperator command, from mathtools:

\documentclass{article}
\usepackage{mathtools}

\begin{document}

  \begin{equation*}
    \smashoperator{\bigcup_{a \in \{\text{set that is very wide}\}}} S_a
  \end{equation*}

\end{document} 

enter image description here

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