Hi Khaled
these virtual versions are essentially the body font counterparts with
lots of display-modifying tweaks piled on to make them behave like
math fonts. These virtual versions were used for a time while the math
fonts were in development.
The virtual counterparts are adaptations of the old TFM/Type1 fonts so
they look like OpenType math fonts to the engine (so that ConTeXt would
move entirely to Unicode/OpenType math while waiting for the real
OpenType fonts).
Which reminds me ... shouldn't we try to get the r2l math symbols into
the lm/gyre fonts? I don't know how much extra that is in xits, but it
would be nice to have it.
Hans
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