# [texhax] Strange interaction with revtex

Donald Arseneau asnd at triumf.ca
Mon Aug 16 07:24:43 CEST 2010

Michael Barr <barr at math.mcgill.ca> writes:

> I got a query from someone trying to use my diagram macros in conjunction
> with revtex.  Finally, I decided to try to track it down.  What follows is
> really strange and I could not begin to imagine how it could be done. Here is
> a sample file:
>
> \documentclass{revtex4}
> \newdimen\ul
> \ul=.01em
> \showthe\ul
> \begin{document}
> \end{document}
>
> Try it; you get the message that \ul=0pt.

Revtex does not select a font until the beginning of the document,
so em is zero until then.

--
Donald Arseneau                          asnd at triumf.ca