double underline

LaTeX double underline

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double underline

To double underline chars (within math enviroment) twice, just use the command \underline two-times.
example
revenue - cost = \underline{\underline{profit}}
$800 - 500 = \underline{\underline{300}}$

If the package ulem is included, the command \uuline could be used:
revenue - cost = \uuline{\underline{profit}}
$800 - 500 = \uuline{\underline{300}}$

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