Returns the names of all math fonts currently loaded by MicroTeX.
These names can be passed to the math_font parameter of
latex_grob and grid.latex.
Font pairing
The bundled math fonts have different styles. For a consistent look,
pair them with a matching fontfamily in gp:
| Math font | Style | Suggested text font |
Lete Sans Math ("lete", default) | Sans-serif | "sans" |
STIX Two Math ("stix") | Serif | "serif" |
Additional math fonts can be loaded with load_font.