[Om] units, was Re: [Om3] svn.openmath.org is now opened

[Jan Willem Knopper]

W Naylor wrote:
> 
> Hi,
> 
> As a start, I would propose that the CDs:
> 
> dimensions1.ocd
> physical_consts1.ocd
> units_*.ocd
> 
> should be grouped into a group/directory (are we talking CDGroups here?) 
> perhaps called physical_entitites. I further would prepose that dimension1 
> should be split into primary dimensions and derived dimensions (I think 
> this was suggested before - either James or Arjeh?) though there is some 
> question as to which symbols should be the primary ones.
> 
A possibility here would be to split the dimensions for the seven base
SI units from the rest.
The dimensions for the seven base SI units are length, mass, time,
electric current, thermodynamic temperature, mass, and luminous
intensity. (m, kg, s, A, K, mol, cd).
(see http://en.wikipedia.org/wiki/SI_base_unit and
http://en.wikipedia.org/wiki/SI_derived_unit)

Is it possible to add the SI derived unit radian (symbol:rad,
dimension:angle) and the non SI unit degree (symbol: U+00B0, 1 degree=
2pi/360 rad) ?

Regards,

Jan Willem Knopper
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