Thanks Herb for your suggestion and sorry for answering so late. I realise I should have been more precise in the description of my problem. I used to prepare my presentations at the university or at home, using iCloud to store them while working on them. Then I would do my Keynote presentations in class with an iPad mini or even an iPhone, for which Keynote is available. Unfortunately, the list of available fonts both in iOS AND Mac OSX is very limited and Chalboard SE seemed to be a « nice » handwriting font for me. I thus wanted to use it also for roman math characters, like variables or function names like cos or sin. That led me to use xelatex and after playing for a while and asking for advice to various people, I put together the preamble that seems clearly unorthodox to TeX specialists like you ou Axel Kielhorn. It is clear that I will never be able to use XITS Math or Asana Math on my Ipad or iPhone, if my presentations are in Keynote format. One solution would be to export them to pdf before sending them to the iOS devices. The other solution is to build my presentations on my iMac on which LaTeXiT accepts my preamble. I’ll probably stick to the latter.
Cheers, Yves -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
