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From: Tobias Burnus <burnus@gmx.de>
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Subject: Re: Math symbols
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Hi David,

> How does one get the double-barred R and C that are usually used to
> represent the sets of real and complex numbers, respectively?
How about \setupbodyfont[ams]

$\Bbb C$ ?

Note that it is also possible to use non-italic bold letters for this purpose.
In my files I've defined these commands, so I can change the layout, if I want.

\def\expe{{\rm e}} % Exponential  e (upright)
\def\dD{{\rm d}}   % Differential d (upright)
\def\iI{{\rm i}}   % Euler's imaginary i (upright)

% set of numbers; format: IR, IN etc.
\def\bfN{{\Bbb N}}
\def\bfZ{{\Bbb Z}}
\def\bfQ{{\Bbb Q}}
\def\bfR{{\Bbb R}}
\def\bfC{{\Bbb C}}

% Alternative: bold and non-italic
%\def\bfN{{\bf N}}
%\def\bfZ{{\bf Z}}
%\def\bfQ{{\bf Q}}
%\def\bfR{{\bf R}}
%\def\bfC{{\bf C}}

> Also, how does one get the fancy symbols that are usually used by
> mathematicians to represent the real and imaginary parts of a complex number?
For a fracture like I and R try \Re and \Im (defined in plain TeX). Or you can
redefine it as {\rm Im\>} and {\rm Re\>} if you want to get Re z and Im z
instead.

Tobias