Hi Frédéric,
1. Stix and Asana have been available in Fedora for a long time
https://admin.fedoraproject.org/pkgdb/acls/name/oflb-asana-math-fonts
https://admin.fedoraproject.org/pkgdb/acls/name/stix-fonts
If you have a problem with them please file a bug
2. MathJax if the usual TEXie badly name
Dear Fedora developers,
I'm one of the main developer of the Mozilla MathML Project. As
explained here
https://developer.mozilla.org/en/Mozilla_MathML_Project/Fonts
http://www.maths-informatique-jeux.com/blog/frederic/?post/2012/04/21/Mozilla-MathML-Project%3A-about-mathematical-fonts
math