At 11:31 AM 10/1/00 -0700, David Arnold wrote:
>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}}]
\definesymbol [realnumbers]     [\hbox{\getglyph{BlackBoard}{R}}]
\definesymbol [complexnumbers]  [\hbox{\getglyph{BlackBoard}{C}}]

$\symbol[naturalnumbers]^{\symbol[naturalnumbers]}$
$\symbol[integernumbers]$
$\symbol[rationalnumbers]$
$\symbol[realnumbers]$
$\symbol[complexnumbers]$

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: 

% output=pdftex

\unprotect

\def\@mch@{@m@ch@} % math char 
\def\@mfm@{@m@fm@} % math family

\expandafter\chardef\csname\@mch@               0\endcsname = 0 
\expandafter\chardef\csname\@mch@               1\endcsname = 1 
\expandafter\chardef\csname\@mch@               2\endcsname = 2 
\expandafter\chardef\csname\@mch@               3\endcsname = 3 
\expandafter\chardef\csname\@mch@               4\endcsname = 4 
\expandafter\chardef\csname\@mch@               5\endcsname = 5 
\expandafter\chardef\csname\@mch@               6\endcsname = 6 
\expandafter\chardef\csname\@mch@               7\endcsname = 7 

\expandafter\chardef\csname\@mch@        ordinary\endcsname = 0
\expandafter\chardef\csname\@mch@           large\endcsname = 1 
\expandafter\chardef\csname\@mch@          binary\endcsname = 2 
\expandafter\chardef\csname\@mch@        relation\endcsname = 3
\expandafter\chardef\csname\@mch@         opening\endcsname = 4 
\expandafter\chardef\csname\@mch@         closing\endcsname = 5 
\expandafter\chardef\csname\@mch@     punctuation\endcsname = 6
\expandafter\chardef\csname\@mch@        variable\endcsname = 7 

\expandafter\chardef\csname\@mch@   largeoperator\endcsname = 1 
\expandafter\chardef\csname\@mch@ binaryoperation\endcsname = 2 
\expandafter\chardef\csname\@mch@   openingsymbol\endcsname = 4 
\expandafter\chardef\csname\@mch@   closingsymbol\endcsname = 5 
\expandafter\chardef\csname\@mch@  variablefamily\endcsname = 7 

\def\definemathfamily#1 % 
  {\expandafter\chardef\csname\@mfm@#1\endcsname=}

\def\definemathcharacter#1 #2 #3 #4 % name class family n  
  {\doifnumberelse{#4}
     {\dodefinemathcharacter{#1}{#2}{#3}{#4}}  
     {\dodefinemathcharacter{#1}{#2}{#3}{`#4}}}

\def\dodefinemathcharacter#1#2#3#4% name class family n  
  {\scratchcounter=\the\csname\@mch@#2\endcsname
   \multiply\scratchcounter by 2048
   \advance\scratchcounter  by \the\csname\@mfm@#3\endcsname
   \multiply\scratchcounter by 256
   \advance\scratchcounter  by #4 
   \expandafter\mathchardef\csname#1\endcsname=\scratchcounter}

\def\mathfamily#1{\expandafter\fam\csname\@mfm@#1\endcsname}

\newtoks\mathdefinitions

\long\def\startmathdefinitions#1\stopmathdefinitions
  {\appendtoks#1\to\mathdefinitions}  

\protect

\startmathdefinitions
  \definemathcharacter naturalnumbers  ordinary blackboard N 
  \definemathcharacter integernumbers  ordinary blackboard I 
  \definemathcharacter rationalnumbers ordinary blackboard Z 
  \definemathcharacter realnumbers     ordinary blackboard R 
  \definemathcharacter complexnumbers  ordinary blackboard C 
\stopmathdefinitions

\startbuffer
$\naturalnumbers  ^ \naturalnumbers  \quad 
 \naturalnumbers  ^ \naturalnumbers  \quad 
 \rationalnumbers ^ \rationalnumbers \quad 
 \realnumbers     ^ \realnumbers     \quad 
 \complexnumbers  ^ \complexnumbers  \quad
 \mathfamily{blackboard}X^X\quad Q^Q $ 
\stopbuffer

\appendtoks \the\mathdefinitions \to \everymath 

\starttext

\setupbodyfont[lbr] \definemathfamily blackboard \mafam  \getbuffer

\setupbodyfont[ams] \definemathfamily blackboard \mbfam  \getbuffer

\setupbodyfont[mt]  \definemathfamily blackboard \mbfam  \getbuffer

\stoptext

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