# Even subscript height

Other things being equal, TeX will aim to position subscripts and superscripts in places that “look good”. Unfortunately, it only does this for the sub- and superscripts of each atom at a time, so if you have

`\$ X^{1}_{2} X_{2} \$`

the second subscript will appear higher, since the first has moved down to avoid the superscript; the effect can be noticeably distracting:

`![[faq-images1.png|faq-images1.png]]`

You can avoid the problem, for a single instance, by

`\$ X^{1}_{2} X^{}_{2} \$`

here, the dummy superscript has the requisite “pushing down” effect:

`![[faq-images2.png|faq-images2.png]]`

While this technique does what is necessary, it is tedious and potentially error-prone. So, for more than one or two equations in a document, the LaTeX user is advised to use the subdepth package, which forces the lower position for all subscripts.

Source: Even subscript height

3_domaines_specialises/mathematiques/harmoniser_la_hauteur_des_indices.txt · Dernière modification: 2020/12/15 22:05 par dbitouze