# How can I adjust the span between under bar and formula

### LaTeX:

$\alpha =\underset{\square }{\overset{\square }{\lim \sup \sqrt[n]{\left|a_n\right|}}}$

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Since the question contains no information about the context, I assume you only want to typeset the expression in a TraditionalForm cell.
Then just highlight the placeholder under the formula and press Ctrl-$\uparrow$ two or three times, according to your taste. Each key press will nudge the placeholder (or superscript) up toward the formula.
You may want to look up AdjustmentBox for more information.