In LaTeX, you can use commands like \mathbb{C}
(in amsfonts
) or \mathds{C}
(in mathds
) to get blackboard bold letters. But how would I get them in plain TeX? I tried {\ds C}
and it didn't work.
2 Answers
Just standard setup; the fonts are msbm10
and related ones.
\font\tenamsb=msbm10 \font\sevenamsb=msbm7 \font\fiveamsb=msbm5
\newfam\bbfam
\textfont\bbfam=\tenamsb
\scriptfont\bbfam=\sevenamsb
\scriptscriptfont\bbfam=\fiveamsb
\def\bbb{\fam\bbfam}
${\bbb N}$ is the set of natural numbers.
\bye
Of course, for serious math typesetting you should use AMS-TeX
\input amstex
\loadmsbm
$\Bbb{N}$ is the set of natural numbers.
\bye