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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