# How to use math symbols below an underbrace?

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?

• 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

\alpha is not \text. Just use \underbrace{x^3}_{\alpha}.