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Message from discussion Placement of sub/superscripts
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Michael J Downes  
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 More options Dec 10 2001, 9:40 am
Newsgroups: comp.text.tex
From: Michael J Downes <eps...@ams.org>
Date: 10 Dec 2001 09:40:24 -0500
Local: Mon, Dec 10 2001 9:40 am
Subject: Re: Placement of sub/superscripts

Henrik Holm <h.h...@spray.no> writes:
> I use ^\mathsf{T} for transpose of a vector/matrix.  What I
> have found is that the subscript of a tansposed vector changes
> its placement, it is pushed downwards a little.  Is there a
> way to avoid this?  I have looked through the amsldoc in
> search of «subscript», but the entries I found did not seem to
> apply to my problem.

For this information you would need to consult Appendix G of the
TeXbook. TeX handling of sub and sup placement is determined by the
fontdimen's of math font 2 (which is usually cmsy). Normally a lone
superscript is placed fairly low, so that it will not collide with
descenders or subscripts from the line above. But when a superscript and
subscript occur together, they are positioned differently to ensure a
minimum amount of space between them.

The rules in Appendix G are a complex web of compromises. When you
change something to make one kind of construct look better, it tends to
have unanticipated side effects in other kinds of constructs.


 
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