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From: "Giuseppe Bilotta" <oblomov@freemail.it>
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Subject: Re: The real numbers
Date: Wed, 4 Oct 2000 22:34:54 +0200
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> >All,
> >
> >Here's another font question. If I am typing my paper in Lucida, what
> >character is usually used to denote the real numbers? the complex
numbers?
> >
> >How can I define a macro, to be used in math mode, to use these
characters?
> >
> >\def\R{definition here}
> >\def\C{definition here}
> >
> >Maybe I should get some instruction how to do this in the Context way as
> >well. Or is using the TeX \def OK?
>
> \definefontsynonym [BlackBoard] [msbm10] % the font where to ick the
glyphs
> from
>
> \definesymbol [naturalnumbers]  [\hbox{\getglyph{BlackBoard}{N}}]
> \definesymbol [integernumbers]  [\hbox{\getglyph{BlackBoard}{I}}]
> \definesymbol [rationalnumbers] [\hbox{\getglyph{BlackBoard}{Z}}]

Uh ... I believe it's integer -> Z and rational -> Q

> \definesymbol [realnumbers]     [\hbox{\getglyph{BlackBoard}{R}}]
> \definesymbol [complexnumbers]  [\hbox{\getglyph{BlackBoard}{C}}]

Sice you were at it,

\definesymbol [hypercomplexnumbers] [\hbox{\getglyph{BlackBoard}{H}}]

:-) [hey, it's a _joke_]

In LaTeX I used something like

\newcommand{field}[1]{\ds{#1}} % where \ds stands for DoubleStruck, a synom
of BB
\newcommand{\R}{\field{R}} % and so on. I knwo some of them like \N and \Z
are not fields, but ... that helped in case I wanted to switch to plain bold

[snip]
>
> Now, this is far from perfect, and since a few weeks ago i needed those
> blackboards myself (it was discussed on this list btw) I cooked up these
> macros which are under construction, look horrible, are not meant for the
> users who get nightmares from seeing this kind of code etc etc so that
that
> may stop reading now:
>
[snap! No, I don't get nightmares from that code, but ...]

Why all those chiffchaffing around? That looks much like redefining a lot of
TeX's default behaviour (or at least, providing hooks to rederfine etc).

> As you can see, I need to extend the font files with some defs as well as
> define a bunch of math symbols which i first have to discuss with taco of
> course,
>
> Hans

Giuseppe Bilotta