On Sun, Oct 03, 2010 at 06:26:51PM +0100, José Carlos Santos wrote: > Hi all, > > If I compile this file: > > \documentclass{article} > \usepackage{fontspec} > \usepackage{xltxtra} > \usepackage{unicode-math} > \begin{document} > $P'$ > \end{document} > > I get this error message: > > ! Undefined control sequence. > <argument> \um_prime_single_mchar > > l.6 $P'$
You need to use a Unicode math font as well, TeXLive have XITS and Asana Math. There is no point in loading unicode-math without using a Unicode math font. I thin unicode-math package should handle this though, like issuing a warning or something. -- Khaled Hosny Arabic localiser and member of Arabeyes.org team Free font developer -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex