On 28/11/2019 01:26, Doug McKenna wrote:
Ross wrote:
| If by ignoring you mean removing the character entirely, then that is surely
not best at all.
|
| Most N Class (Normal) characters would be simply of the default \mathord
class.
The parsing code in load-unicode-math-classes.tex installs values in the
\Umathcode table that comport with some rule, which without too much of a close
look seems to me to be whether the character code math class read from
MathClass.txt is one of the eight possibilities that parsing code pays
attention to, out of the 15 possible ones in the file. Therefore it appears to
me that all entries in MathClass.txt that are marked with, for instance, 'N',
are ignored with respect to installing any entry in the \Umathcode table.
It may be that such characters in MatClass.txt marked with 'N' take on the
\mathOrd attribute by default when TeX finds them within math mode, I'm not
sure without looking at its code.
Doug McKenna
The loader is intended for use in IniTeX mode and so relies on the
defaults. As you say, characters are already \mathord unless actively
set to something else.
Joseph
