On 2010-12-08, Jürgen Spitzmüller wrote: > Jürgen Spitzmüller wrote:
>> Justin Wood wrote: >>> 1. conflict with AMS package >>> I've found that simply activating XeTeX under *Document Settings – >>> Fonts*will cause parsing errors on viewing if the document also has >>> *Math Options – Use AMS math package* checked; eg, LaTeX Error: Command >>> `\Finv' already defined, etc. I think this is a known conflict between >>> XeTeX and the AMS package, is that right? By changing the setting to *Use >>> AMS math package automatically* though, these particular errors go away. >>> Note that this occurs in the generic default new document (*article* >>> class) as well as the *KOMA-script book *class that the thesis uses. >> Yes, I've seen this too. Not sure what to do. We could disable "AMS >> always" for XeTeX, if necessary, but I guess we need to do some more >> research yet. Please never disable "AMS always" but not "AMS automatically": this would lead to errors as soon as an AMS-requiring construct is put into the document. > This should be fixed as well in the next release. The trick is to load all > AMS packages before fontspec (which itself loads xunicode, which has to be > loaded after the AMS packages). See > http://www.macfreek.nl/mindmaster/LaTeX_package_conflicts#Amssymb_with_Xunicode I am glad you found the core of the problem. (BTW: the current version of fontspec does no longer load xunicode, but we should care for users with older versions.) Testing here with a pre-beta-2 SVN version, LyX 2.0.0svn (not released yet) Built on Nov 26 2010, 14:31:19 I get %% LyX 2.0.0svn created this file. For more info, see http://www.lyx.org/. %% Do not edit unless you really know what you are doing. \documentclass[british]{article} \usepackage{fontspec} \usepackage{amsmath} \usepackage{amssymb} \usepackage{xunicode} \usepackage{xltxtra} \usepackage{polyglossia} \setdefaultlanguage[variant=british]{english} \begin{document} Hallo $\Rrightarrow$. \end{document} which compiles fine. However, I also found that even if I do not check any of the AMS math options, LyX 2 behaves as if the "Load AMS math automatically" option were set: a) the "AMS symbols" toolbox is enabled. b) inserting a symbol from it inserts \usepackage{amssymb} in the preamble. c) even writing \Rrightarrow in a math box (converts this to the symbol and) inserts \usepackage{amssymb} in the preamble. Because of c), a work-around with disabling AMS math in the checkbox and loading in the LaTeX preamble will fail. Günter Günter
