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I have an equation with an intersection which has multiple limit levels, like this,

\[
\langle H, H'\rangle = \bigcap_{\substack{
L \leq G, \\
H \cup H' \subseteq L.
}}L
\]

enter image description here

It compiles nicely, but that code prints L and the equal sign too far apart from the intersection. Is there a way to eliminate those spaces in order to make the equation look better?

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2 Answers 2

up vote 8 down vote accepted

mathtools provides the macro \mathclap (and also \crampedclap, \smashoperator) for precisely this occasion (see pages 4–7 of the manual):

\usepackage{mathtools}
%...
\begin{equation*}
  \langle H, H'\rangle = \bigcap_{\mathclap{\substack{
  L \leq G, \\
  H \cup H' \subseteq L.
  }}}L
\end{equation*}

Result of LaTeX example

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Try \usepackage{mathtools} and

\[
\langle H, H'\rangle = \smashoperator{\bigcap_{\substack{
L \leq G, \\
H \cup H' \subseteq L.
}}}L
\]
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