These fonts are needed for the visual math symbol display in LyX. They can also be used to display MathML in Gecko-based browsers like Iceweasel.
The following fonts are included in this package:
* cmex10 - Computer Modern math extension * cmmi10 - Computer Modern math italic * cmr10 - Computer Modern Roman * cmsy10 - Computer Modern math symbols * esint10 - Alternate integrals * eufm10 - Euler Fraktur (medium-weight) * msam10 - Extra math symbols, first series * msbm10 - Extra math symbols, second series, including Blackboard Bold * wasy10 - Waldi symbol fonts