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 > > > > >