Gennady Uraltsev <gennady.uraltsev@gmail.com> writes:

> 2) LaTeX (or at least AMS) forbids expressions of the type $a_b_c$ and
> $a^b^c$.
>
>
> ERROR: Double subscript.
>
> --- TeX said ---
> l.106 $a_b_
>            c$
> --- HELP ---
> There are two subscripts in a row in a mathematical
> formula---something like x_{2}_{3}, which makes no sense.
>
> The only acceptable syntax is:
>
> $a_{b_c}$

Ah, right.  That makes things a bit easier.  Basically, we can assume
that in $a^{b^c}$ the {b^c} part is already fontified and risen, so in
the case where we are going to fontify ^c we would need to
increment/decrement the `raise' value.  I'll play around with this.

Bye,
Tassilo