# Unwanted separation in an equation

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

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


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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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*}


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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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