[XeTeX] Typesetting Greek mathematical text using Unicode

[Andrew Moschou]

Try this, it works:

\documentclass[a4paper]{article}
\usepackage{xltxtra}
\setmainfont[RawFeature=-ccmp]{Cambria}
\begin{document}
Ἀριθμὸς  \char"1F08
\end{document}

There is an instruction in the font that says, when we come across Ἀ,
replace it with Alpha and the smooth breathing mark. But in its design, the
smooth breathing mark gets positioned close to the right of the Alpha. So
we need to turn off this feature.

Andrew
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