[texhax] Strange behavior of \mathop

Donald Arseneau asnd at triumf.ca
Tue Nov 9 22:05:18 CET 2010

Michael Barr <barr at math.mcgill.ca> 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).

Donald Arseneau                          asnd at triumf.ca

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