Hi All, I would load the cambria math from the file Cambria.ttc with XeLaTeX.
By looking in the documentation of the fontspec package, I have found that indexes should be used. \setmainfont{Optima.ttc}[ Path = /System/Library/Fonts/ , UprightFeatures = {FontIndex=0}, BoldFeatures = {FontIndex=1}, ItalicFeatures = {FontIndex=2}, BoldItalicFeatures = {FontIndex=3} ] I have seen nothing similar for the command \setmathfont. If it is possible to load a math font from a ttc file what should be the label before the equal sign (MathFont?). Usually, I use Cambria Math by using the font name instead of the file but sometimes it is more convenient to use directly the font file on the disk. best regards, -- Pierre Dupond <76nem...@gmx.ch>