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I'm trying to use \alpha below an underbrace but it doesn't appear, in fact it also breaks the rest of the pdf. Especifically I'm doing this:

\underbrace{x^3}_\text{ \alpha } 

What is the correct way to do that?

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    Why \text? Simply $\underbrace{x^3}_{\alpha}$ works just fine. Jun 22 '17 at 0:03
  • Welcome to TeX.SX! Please make your code compilable (if possible), or at least complete it with \documentclass{...}, the required \usepackage's, \begin{document}, and \end{document}. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to give you a hand. Help them help you: remove that one hurdle between you and a solution to your problem. Jun 22 '17 at 7:29
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\alpha is not \text. Just use \underbrace{x^3}_{\alpha}.

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