[texhax] apostrophe/transpose with subscripts

[Martin Heller]

Robert Duval wrote:
> Dear All
> 
> I want to write a formula of the style X'_nX_n. (note the
> transpose/apostrophe after the first X)
> 
> However, as i type this in math mode i get that the subscript n of the
> first X lies below the one of the second X.
> 
> I want both subscripts to be at the same height.
> 
> I could do it by implementing either
> 
> {X'}_n or {X_n}'
> 
> but the look of these is not what i want. I really would like the
> apostrophe above the _n and both subscripts to be at the same height.
> 
> Any help on how to achieve this would be greatly appreciated

If it is only this one formula then X'_nX^{}_n should do. If you want to 
unify the height of sub- and superscripts in all formulas you can use 
package subdepth <http://www.ctan.org/pkg/subdepth>.