Bold Math
see MyWay No.5 about "Mixed Normal and Bold Math" by Pragma
David Munger wrote in this post and its followup:
I've just found a little workaround for using boldsymbols. It works even with the nath module. It's probably not the best way of doing it, but since it does the trick for me, I guess it might useful to other ConTeXters.
\define[1]\boldsymbol{{\hbox{\formula{\bfm #1}}}}
When using nath, it doesn't work with inline formulae. So in that case, better use
\unprotect \define[1]\boldsymbol{{\hbox{\o@dollar \bfm #1 \o@dollar}}} \protect
I also have to:
\definebodyfont [17.3pt,14.4pt,12pt,11pt,10pt,9pt,8pt,7pt,6pt,5pt,4pt] [mm] [mrbf=cmbx10 sa 1, exbf=cmex10 sa 1, mibf=cmmib10 sa 1, sybf=cmbsy10 sa 1, mabf=msam10 sa 1] \setupformulae[method=bold]
Then, I may define very handy commands like
\define\grad{\boldsymbol{\nabla}} \define[1]\vec{\boldsymbol{#1}} \define[1]\unitvec{\hat{\vec{#1}}}
and formulas like this typeset perfectly:
\[ \grad h = a \unitvec{n} \]
