> To get back to my problem:
> 
> The default Ctx bodyfont (CMR) is all right for me, I don't need to change it 
> (but it's possible, if it should simplify something).

If you don't need CMR, than simply don't use. It does not have greek 
boldmath/upright anyway.

> If I understand well, the default Ctx font - CMR - is used for typesetting 
> [bold]math as well. But the problem is that it fails when typesetting bold 
> Greek letters.

Right.

> What code - \typescript, \define???font??? - to use?
> 
> Just to make the code "$Abc \alpha = {\aSwitchToBoldMath Abc \alpha} = or 
> \aCommandToTypeBoldMath{Abc \alpha}$ work.

Minimal example that uses Tex Gyre Pagella and Heros for serif and sans, and 
either Cambria, Asana, Neo Euler, or XITS for math (comment in your choice and 
make sure that context finds the fonts):

\starttypescript [myface]
  \definetypeface [\typescriptone] [rm] [serif] [pagella] [default]
  \definetypeface [\typescriptone] [ss] [sans]  [heros] [default]
  \definetypeface [\typescriptone] [tt] [mono]  [modern] [default]
  %\definetypeface [\typescriptone] [mm] [math]  [cambria][default]
  %\definetypeface [\typescriptone] [mm] [math]  [asana][default]
  %\definetypeface [\typescriptone] [mm] [math]  [euler][default]
  \definetypeface [\typescriptone] [mm] [math]  [xits][default]
\stoptypescript

\setupbodyfont[myface]

\starttext
  Pagella \par
  {\ss Heros} \par
  {\tt Modern Typewriter} \par
  $Abc \beta = {{\bi Abc} \bf Abc \beta \mathgreekupright \beta}$
\stoptext

Note that Neo Euler does not have italics and there are no fallbacks for 
bold/greek italic. So ${\bi A} \bf \beta$ will be displayed as $A \beta$.

Best wishes,
Florian

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