General ⇒ Multiple lines in mathematical formula

[pittopitto]

Hello, I have a little problem. I need to build a special mathematical formula that contains multiple overlines or underlines, but in this format:

Code: Select all

---------
       ---------
AA     BB     CC

That is if, for example I have three variables AA, BB and CC, I need to put one line on AA and BB and another line on BB and CC.

How can I do that in LaTeX?

Thanks a lot

pitto

[gmedina]

I don't know if there is a package that directly allows you to achieve what you want, but below I include a possible solution:

Code: Select all

\documentclass{article}
\usepackage{amsmath}

\begin{document}
\newlength{\expWidth}
\settowidth{\expWidth}{AABB}
\[
 \overset{\rule{\expWidth}{0.5pt}\hfill}{AA\overline{BBCC}}
\]
\end{document}

Basically, I used \overline to draw a line from BB to CC and then \overset to place a line from AA to BB.