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\documentclass{amsart}


\begin{document}
$\chi_{A}$

$\chi_{S_{i}}$

\end{document}

I found that the $A$ in $\chi_{A}$ does not look like a subscript; it seems too large. This problem becomes more obvious in the second example, $\chi_{S_{i}}$, which looks like $\chi S_{i}$. How do I fix this?

Yes
  • 1,639
  • Okay, yes, thank you for your efforts. I did not find it. – Yes Jun 16 '15 at 12:18
  • You've deleted the the Font question some minutes ago -- Well, I want to delete my answer to it too, but I can't it. So undelete it please, I will delete my answer, you can delete your question, if you really think this is necessary. –  Jul 05 '15 at 12:20

1 Answers1

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Is the following too trivial?

\documentclass{amsart}


\begin{document}
$\chi_{\raisebox{-.5ex}{$\scriptstyle A$}}$

$\chi_{\raisebox{-.5ex}{$\scriptstyle S_{i}$}}$
\end{document}
GuM
  • 21,558
  • Thank you. It works perfectly. But, since I may use chi with subscripts (as an indicator function) many times, is there any alternative once-and-for-all way? – Yes Jun 16 '15 at 12:13
  • In my opinion, the better question is, why is $\Chi$ written so 'low' by default? I also somehow struggle with it. – phx Jun 16 '15 at 12:15
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    It's not ‘so low’. χ is a Greek letter with descenders, exactly the same as f, p or q for Computer Modern. – Bernard Jun 16 '15 at 12:22
  • @Bernard: I wanted the effect to be clearly visible, so I chose a pretty large value. One can substitute a smaller one, e.g., -3ex. You might also want to have a look at the answer I added to the other similar question. – GuM Jun 16 '15 at 12:39
  • Yes. I think another solution might be to have a (slanted) mathsc alphabet. The problem doesn't happen only with χ, but with lowercase variable with descenders. Or one mightto defines different sizes for sub(sub)scripts, depending on whether they're uppercase or lowercase letters. – Bernard Jun 16 '15 at 12:49