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Re: Units question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg115487] Re: Units question
  • From: "Scot T. Martin" <smartin at seas.harvard.edu>
  • Date: Wed, 12 Jan 2011 04:08:11 -0500 (EST)

Ted,

That's because Mathematica does not know if the variable Meter is positive 
or negative. You can using an Assuming[] formulation to tell Mathematica 
that Meter is positive. Then, voila.

Assuming[
{Positive[Meter], Positive[Second]},
  Refine[(Sqrt[Meter^2/Second^2] Second)/Meter^2]
]

I think I wrote this once in the MathArchives already, too, so you can 
check those.

Scot

On Tue, 11 Jan 2011, Ted Sariyski wrote:

> Hi,
> Working with units I get correct result:
>
> Sqrt[Meter^2/Second^2] Second)/Meter^2
>
>  How to tell Mathematica to simplify the result to Meter^-1?
> Simplify and FullSimplify doesn't do the job.
> Thanks in advance,
> --Ted
>
>
>
>
>


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