Mathematica:
LaTeX:
$\alpha =\underset{\square }{\overset{\square }{\lim \sup \sqrt[n]{\left|a_n\right|}}}$
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Sign up to join this communitySince 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.