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How do you underline text?

Also how do you underline math?

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  • 4
    \underline{} works for both
    – Null
    Commented Apr 2, 2015 at 16:33
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    In addition to Null's answer, you can use \usepackage[normalem]{ulem} with \uline{YourText} which allows line breaks as well. Or you can avoid underlining altogether as it is not very elegant solution for emphasizing!
    – Pouya
    Commented Apr 2, 2015 at 16:37
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    Your question is a little bit unspecific. And why tag latex-project? BTW: underlining is in my opinion not a good typography. Better use italic.
    – Mensch
    Commented Apr 2, 2015 at 16:56
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    We don't underline text (it's not a joke).
    – percusse
    Commented Apr 2, 2015 at 17:40
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    Some journals I have submitted to require underlining instead of italics ... The question is legit (although (s)he could easily have found the answer by googling).
    – Sverre
    Commented Apr 2, 2015 at 17:47

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Preface: You should really consider to use macros like \emph for emphasizing text. Underlining is from the typewriter-era and is not necessary anymore.

You have some options:

  • the macro \underline which is pretty inflexible
  • the package ulem (best to load with normalem option) and its macro \uline (supports linebreak)
  • the package soul and its \ul
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