[racket] Numbers with dimensions

On Mon, Oct 28, 2013 at 07:54:22AM +0100, Konrad Hinsen wrote:
> Laurent writes:
> 
>  > Indeed, the notion of dimension is not really what I was after. My intention was rather
>  > to provide a useful unit converter.
> 
> Fair enough.
> 
>  > If my current units are in N, and I multiply by square seconds, I
>  > think it's not always desirable for the measure to be automatically
>  > converted to m.kg.
> 
> N/s^2 and m kg are the same unit, so there is nothing to convert. The normalized
> form in the SI system is m kg, so one could consider N/s^2 an alias for it.

It's a matter of language here, not physics.  N/s^2 and m kg may be the 
same units, but they are different words.

Kind of a matter of user-interfacing.

-- hendrik