[NTG-context] How to \bf for math?

[David Munger]

Adam Lindsay wrote :
> David Munger wrote:
> > Very interesting, but with these definitions, I can't get roman
> > characters in formulae. For the moment, the best solution for me is
> > still the hbox wrapper.
> 
> Okay.
> What do you mean by "can't get roman characters"? Can you give an 
> minimal example?
> 
> adam

Sorry, I should have given one.

\startmathcollection[default]
\definemathcharacter [a]   [nothing] [mi] ["61]
\stopmathcollection

\definetypeface [] [mm] [bfmath] [computer-modern] [computer-modern]
\setupformulas [method=bold]

\starttext
\formula{a, {\rm a}, {\bfm a}, {\bfm\rm a}}
\stoptext

I can't get bold roman math. And by using [mr] instead of [mi]:
\definemathcharacter [a]   [nothing] [mr] ["61]
one gets the inverse problem: no more bold math italic.

David