On Saturday, 28 October 2017 at 00:14:15 UTC, Ivan Kazmenko wrote:
> For an argument, the TEX command "^" accepts either a single
> character or a bracket-enclosed string of arbitrary length. So
> $3^3^3$ indeed transforms to ${3^3}^3$, but not for some deeper
> reason this time.
On my TeX compiler, $3^3^3$ makes it give a warning/error.