LaTeX Blackboard Bold 1
LaTeX blackboard bold one A request to my math-oriented readers. Does anyone know how to do a good blackboard bold 1 (one) in LaTeX? The simple \mathbb{1} doesn’t work because the numbers aren’t defined in the mathbb font. I’ve come up with the following hack, which produces the image at left, but it’s not perfect, because it’s not actually a font glyph but a 1 with a line. If you’ve got a better way, please let me know.
\newcommand{\1}{{\rm 1\hspace*{-0.4ex}%
\rule{0.1ex}{1.52ex}\hspace*{0.2ex}}}
Comment by Phil Armstrong
\documentclass{article}
\usepackage{bbold}
\begin{document}
${\mathbb 1}$
{\textbb 1}
\end{document}
