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This question already has an answer here:

How would I underline an equation with a curly brace and an explanation?, like I've pictured below?

I've tried to use the amsmath package, but the \underline directive does not produce the brace and creates ugly space between the A, B and =.

enter image description here

marked as duplicate by Mico equations Oct 7 '16 at 19:29

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 \usepackage{amsmath}
  ..........
 \begin{document}

 \[\underbrace{A=B}_{\text{Fermat}} \]
  ...........

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