Math & Science ⇒ Problem with uuline (package ulem)

[snowflake]

Hi,

I'd like to double underline in math-mode. I'm using uuline (package ulem) for this, but I have troubles with it. There is far too much free space below double-underlined characters. I don't have these problems with uline btw.
Here's a comparison of non-underlined, uline and uuline:

Code: Select all

\documentclass[a4paper]{article} 
\usepackage{color}
\usepackage{ulem}  
\begin{document}
		\colorbox{green}{$r$}
		\colorbox{green}{$\uline{r}$}
		\colorbox{green}{$\uuline{r}$}
		\colorbox{green}{$r_I$}
		\colorbox{green}{$\uline{r}_I$}
		\colorbox{green}{$\uuline{r}_I$}
\end{document}

As you can see, it's even uglier with subscripts.
Do you know what is causing this problem and how to solve it?
Thanks in advance!

[snowflake]

The problem is solved now (more or less). ulem is not designed to work in math mode. The author says:

The various underlining commands are essentially textual, and will not
work quite the same in math mode. But since some font commands, in
the old-LATEX style (‘oldlfont’) serve both for text and math, math mode is
handled (in an approximate way). Generally, you should avoid using ulem’s
commands within math, but math may appear in the text argument to
ulem’s commands.

source: http://mirror.ctan.org/macros/latex/con ... m/ulem.pdf

So the obvious solution is to use \underline{\underline{}} instead.

[Stefan Kottwitz]

If nested \underline works, great!
For underlining, also the soul package could be useful.

Stefan

[cgnieder]

Board rules (4.1) state that crosspostings have to be mentioned as such.

Regards