More seriously, I think that for some people the distinction between Z
and boldface Z might be hard to pick out (visually, that is). \mathbb
{Z} is unambiguous, has a nice chalkboard equivalent, and so on. I
know at least that trying to get anyone to tell the difference between
v and bold v in any vector setting - whether in a book or on the
chalkboard - is nightmarish, which is why putting those little arrows
over vectors is so helpful. Presumably the same people who need the
large-print version of things would also find \mathbb helpful.
So even though it looks nice in a book, there might be something to be
said for standardizing a notation that allows one to separately talk
about some other thing Z (for instance, a variable for a form) if that
is helpful. Not that that has anything to do with Sage.
- kcrisman
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