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I just noticed that for kpfonts and times (and probably other fonts since it does not seem to be font-related), the subscripts on boldface letters like V are (I would say) wrong. Is there an explanation?

\documentclass{book}
\usepackage{times}
%\usepackage{kpfonts}
\begin{document}
$\mathbf{A}_a$ $A_a$ $\mathbf{V}_a$ $V_a$
\end{document}

enter image description here

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Have you tried just using \bf{A}_a? I was instructed by more senior posters here to never use \mathbf{ } in mathmode. –  user16208 Oct 28 '12 at 6:02
2  
@Jase I believe that senior posters here recommend to never use \bf. –  egreg Oct 28 '12 at 8:30
    
@egreg Oh yes, you're right. I had a false memory. –  user16208 Oct 28 '12 at 11:06

1 Answer 1

up vote 6 down vote accepted

Implicit kerning is not taken into account for math letters and their subscripts. Only the italic correction is considered. As workaround the spacing can be manually fixed, e.g.:

\documentclass[a4paper]{book}
\pagestyle{empty}
\begin{document}
$\mathbf{A}_a^a$ $A_a^a$ $\mathbf{V}_a^a$ $V_a^a$
$\mathbf{V}_{\!\!a}$ $V_{\!a}$
\end{document}

Result

Package times does not matter, because it was only used for the page number.

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Thanks. And this implicit kerning could be taken into account in the future, or it is just not possible. –  pluton Oct 28 '12 at 15:23

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