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 ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------