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In this math code:

\exists^\omega n : \alpha [0,n] \notin A

it adds some empty space before and after :.

I want to avoid/remove the space before it. How?

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up vote 15 down vote accepted

Use \colon instead of :.

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For example:

$\exists^\omega n \mathalpha{:\,} \alpha [0,n] \notin A$
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