sansmath undoes custom mathbb alphabet

Question

I need mathbb symbols for 0 and 1. Currently I'm doing this using the bbold fonts. This works great:

\documentclass[10pt]{article}
\DeclareMathAlphabet{\mymathbb}{U}{bbold}{m}{n}
\usepackage{amsmath}
\begin{document}
\begin{displaymath}
\mymathbb{0}
\mymathbb{1} x + y
\end{displaymath}
\end{document}

However, in another part of my document, I'm using sansmath. As soon as I include the sansmath package, the bbold fonts break, even if I don't use sansmath.

How can I get sansmath to stop breaking the other math fonts?

What's odd is it only seems to break for numbers. mymathbb{N} works just fine.

Maybe it would just be easier to lift those two symbols from the font you know has the ones you need: Importing a single symbol from a different font — barbara beeton, Jan 13 '23 at 19:39

score 1 · Accepted Answer · answered Jan 14 '23 at 07:13

(Not quite an answer.)

The offending lines are in sansmath.sty:

\DeclareMathSymbol{0}{\mathord}{operators}{`0}
\DeclareMathSymbol{1}{\mathord}{operators}{`1}
...

which globally declare 0 and 1 to use the operators symbol font.

I don't have a good workaround beyond creating a local copy of sansmath.sty in which these lines are commented out. But maybe this will be good enough for you!

sansmath undoes custom mathbb alphabet

1 Answers1