John, The following example works ok with WXAgg (Hoorray!)
> but the exponent 4 at the end of the expression does not
> show up (with or without brackets).
Yes, there is a bug in the parser for over/under subscripts. I think
I have the fix for it, but haven't been able get it done yet.
> Also, an anoying thing is the need for spaces around TeX
> markup. The same expression does not get formatted by
> mathtext if you remove the spaces. This is going to
> confuse TeX users since LaTeX doesn't need spaces.
Yes, at the least a \/ symbol would be nice.
> one last thing: after you close the WXAgg figure, the
> execution does not return to the interpreter. This does
> not happen on GTK.
OK, thanks for letting me know.