On Wed, Jun 20, 2012 at 3:53 PM, Harold Erbin <[email protected]> wrote: > > If you want another example that let feel that unit and quantity are two > different concepts is that 0.001 km or 1.6 km are units (m and miles), > but if you get 2 km, then you have no corresponding units. And if you > say that it could be an unit, so are all the numbers times an unit but > in this case you have too much freedom.
Well, having a unit of 2km looks quite fine to me :-) However, I guess I'm discarding to many implications which are better visible to a physicist, so I desist from further insisting on this point. > Units which are logarithmic or with an offset can not be exactly > combined as if they where number if there are also "normal" units. For > example in thermodynamics you should take a great care when using °C. I see; again, I most likely miss some physical insight, so, having publicised my opinion, I thank you for responses you have provided and I stop flooding on this topic :-) Sergiu -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
