bug#21103: 24.5; LaTeX input mode: add more blackboard bold characters

[Lars Ingebrigtsen <larsi@gnus.org>]

Ansgar Burchardt <ansgar@43-1.org> writes:

> I miss at least ℂ (field of complex numbers), 𝔽 (generic field), 𝕂
> (generic field, German), ℍ (quaternions), 𝕀 (identity map), ℚ (field of
> rational numbers), ℤ (ring of integers). Others might miss a few more
> that are in common use, see [1].
>
> The attached patch adds all blackboard bold capital characters and "1"
> and "2" using the codepoints from the referenced Wikipedia article.

[...]

> This patch adds all capital blackboard bold letters and those for "1"
> and "2". Most characters are in common use in mathematics, but it does
> not seem useful to exclude the few not widely used.

It does seem more consistent to add them all, yes...

> - ("\\Bbb{N}" ?ℕ)			; AMS commands for blackboard bold
> - ("\\Bbb{P}" ?ℙ)			; Also sometimes \mathbb.
> + ("\\Bbb{A}" ?𝔸)			; AMS commands for blackboard bold
> + ("\\Bbb{B}" ?𝔹)			; Also sometimes \mathbb.
> + ("\\Bbb{C}" ?ℂ)
> + ("\\Bbb{D}" ?𝔻)
> + ("\\Bbb{E}" ?𝔼)
> + ("\\Bbb{F}" ?𝔽)
> + ("\\Bbb{G}" ?𝔾)
> + ("\\Bbb{H}" ?ℍ)

(etc)

A question to the other Emacs maintainers -- would a change like this,
which is more than 15 lines, require a copyright assignment?  It's not
very "code-ey"...

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no