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MathGroup Archive 2007

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Re: Problems with simplify and Sqrt[a^2]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73896] Re: [mg73845] Problems with simplify and Sqrt[a^2]
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sat, 3 Mar 2007 00:48:59 -0500 (EST)
  • Reply-to: hanlonr at cox.net

Sqrt[(-3)^2]

3

expr=v3/Sqrt[v1^2]/Sqrt[v2^2]-v3/v1/v2;

Simplify[expr,{v1>0,v2>0}]

0


Bob Hanlon

---- dshortho <david.shorthouse at credit-suisse.com> wrote: 
> any help on this one:
> 
> if you type in:
> v3/Sqrt[v1^2]/Sqrt[v2^2] - v3/v1/v2
> 
> you get the same expression
> 
> Even if you then type
> Simplify[%]
> 
> you still get the same expression
> 
> I would have thought Mathematica would have resolved Sqrt[v1^2] to v1 (!?)
> 
> Does anyone out there know why it does not do this, as it is causing some problems with some proofs I am doing ?
> 



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