[texhax] Strange behavior of \mathop

[Uwe Lueck]

"Donald Arseneau" <asnd at triumf.ca>, 09.11.2010 22:05:18
>Michael Barr  writes:
>> I was vaguely aware that \mathop sometimes lowers its argumet, but I was
>> unprepared for this.  Look at the following two, nearly identical files,
>> paying close attention to the vertical placement of the bold "E"s.
>> 
>> \documentclass[12pt]{article}
>> \def\E{\mathop{\bf E}}
>
> Use \mathbf{E} instead of the LaTeX 2.09 \bf, and all is consistent.
>
> The old-style font commands introduce spurious {} for the first
> instance at a particular size, so your E is not a single char.
>
> That is bug "latex/3357 (2001-08-04): font commands give {} in math mode"
> that was never fixed (even though I submitted a patch with the report).

http://www.latex-project.org/cgi-bin/ltxbugs2html:

    Warning: latex/3357 could not be found!

Entering "keyword" "font" or "\bf":

    Warning: The reference `'  is not valid.

?

Cheers, 

    Uwe.