[XeTeX] Bold unit vectors

[Javier Bezos]

Ross,

> Because there is no need for it. When the vectors (bold) i, j, k are
> defined to be the standard basis vectors, then they are already unit
> vectors. Putting a hat over them is quite superfluous. That there is no
> easy way to do this in Unicode is surely indicative that standard usage
> does not require it, so you should be discouraged from attempting to do
> so.

Somewhat off-topic, but math notations cannot follow strict rules
and you may want a hat over any i or j -- perhaps a special basis
(eg, a rotating one). You can find the hat (with the dot) for
example in Schaum's Continuum Mechanics, by Mase. Redundancy,
when consistency is also important, is not always a bad thing.

Regards
Javier