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Some equations are sometimes slightly too wide. One way is to manually add \! commands wherever it seems relevant in the equation. Is there an automatic alternative to:

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Why should you want this? Just to break uniformity in your document? – egreg Dec 1 '12 at 15:08
I have a few equations that are a bit too wide. I want to locally slightly reduce inter-space to avoid margin non-alignment. – pluton Dec 1 '12 at 15:11
This is surely the last remedy to try. – egreg Dec 1 '12 at 15:12
breaking the equations onto two lines does not seem recommended in the current configuration. – pluton Dec 1 '12 at 15:16
up vote 7 down vote accepted

Only do this as a last resort....

enter image description here


\advance\thickmuskip -2mu 
\advance\medmuskip -1mu minus -1mu

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