Using mathtools
's \prescript
, the subscripts in $\prescript{}{n}X_m$
are not vertically aligned. The problem does not seem to appear when using ${}_n X_m$
, but this is undesirable for other reasons.
It seems \prescript
does not take into account empty sub/superscripts, like TeX's mechanism does?
Of course I can do $\prescript{}{n}X^{\mbox{}}_m$
, but I'd rather have the n
up than the m
down...
mathtools
.leftidx
package has a better placement.^{}
suffices, instead of^{\mbox{}}