# [XeTeX] dealing with $character Bruno Voisin bvoisin at mac.com Wed Jul 7 21:42:25 CEST 2004 Le 7 juil. 04, à 20:08, Stephen Moye a écrit : > Catcodes tell TeX the function of a particular character. Normally$
> has a catcode of 3 which tels TeX that math is being typed in. A
> catcode of 12 tells TeX to treat this as an "other" character with no
> special significance -- just print it. There is a list of the catcodes
> and their significance in The TeXBook, p 37.

In case you (Bruce) are more accustomed to LaTeX than plain TeX, you
may be more familiar with the commands \makeatletter and \makeatother,
defined in latex.ltx as:

\def\makeatletter{\catcode\@11\relax}
\def\makeatother{\catcode\@12\relax}

Bruno Voisin