On 2013–05–20 Wim W. Wilhelm wrote:

> How can I get boldface characters and symbols  (\bf)  in mathmode.
> I'm using mkiv from TexLive 2012.

The following works with the current beta:

\starttypescript [palatino]
  \definetypeface [palatino] [rm]  [serif] [palatino] [default]
  \definetypeface [palatino] [mm]  [math]  [euler]    [default]
  \definetypeface [palatino] [ss]  [sans]  [modern]   [default]
  \definetypeface [palatino] [tt]  [mono]  [modern]   [default]
\stoptypescript

\setupbodyfont [palatino]

\starttext
   \startformula
    a^2 + b^2 = c^2
  \stopformula
  \startformula
    \bf a^2 + b^2 = c^2
  \stopformula
\stoptext

Marco