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Good morning,

I would like to write a mathematical equation like:

$F_{i}$

but I want to shift down the letter i more than the effect of the command $_$.

AboAmmar
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A H
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1 Answers1

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A quick fix: use an empty superscript along with the subscript. Compare the following.

\documentclass[12pt,a4paper]{article}
\usepackage{amsmath}
\begin{document}

$F_{i} F^{}_{i}$

\end{document}

enter image description here

Lowering the subscript gives the optical illusion that it also shifted to the right, to make this less obvious, I agree on the suggestion by @Bernard to use \mkern-1.5mu. See a comparison $F^{}_{i}$ vs. $F^{}_{\mkern-1.5mu i}$:

enter image description here

AboAmmar
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  • +1. In addition, do suggest to "snug up" the subscript term to the letter F, by writing $F^{}_{\!i}$. – Mico Jun 09 '18 at 13:58
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    @Mico: Perhaps -3mu is too much. \mkern -1.5mu (or -1mu) would be preferable, don't you think? – Bernard Jun 09 '18 at 14:02
  • @AboAmmar Thank you for your answer. Could you tell please how to make a long bar in math mode. Usually I use \bar{x} but the bar is long enough. Thank you – A H Jun 09 '18 at 14:06
  • @Bernard - To my eyes, \mkern-3mu is about right for the F-i combination; however, as always, there's no arguing about tastes, right? :-) For sure, though, F_{\mkern-1.5mu i}^{} is preferable to F^{}_{i}. – Mico Jun 09 '18 at 14:08
  • @AH -- Use \overline{x}, it is wider. – AboAmmar Jun 09 '18 at 14:11
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    @Mico: Non est disputandum indeed (oops… enim) :o) – Bernard Jun 09 '18 at 15:31