[luatex] Kerning: when does it not work?

[Ulrike Fischer]

Am Wed, 04 May 2011 12:45:47 +0200 schrieb Paul Isambert:

> Well, there isn't much to say. To sum up, the problem is: the url 
> package typesets urls in math mode and inserts 0-width glues;

url doesn't insert 0-width glue but the math mode is doing it. You
are seeing \medmuskip and \thickmuskip which url sets locally to
0mu.

\documentclass{article}
\begin{document}
$a+b=c$

\medmuskip=50mu \thickmuskip=100mu

$a+b=c$

\end{document}



-- 
Ulrike Fischer