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Re: Simplifying Sqrt[a^2*d^2] -> a*d

  • To: mathgroup at smc.vnet.net
  • Subject: [mg8389] Re: [mg8302] Simplifying Sqrt[a^2*d^2] -> a*d
  • From: seanross at worldnet.att.net
  • Date: Tue, 26 Aug 1997 20:41:27 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Carlos A. Felippa wrote:
> 
> I want Sqrt[a^2*d^2] to be automatically simplified to a*d
> wherever it appears in a very complex expression.
> 
> In another system I simply declare a and d real nonnegative and let the
> program figure out the rest.  How do I do that in Mathematica?
> The obvious rule expr/.{Sqrt[a^2*d^2]->a*d}  does not work.

You probably need the RealOnly package.  You might also try the
definition  NonNegative[a]=True; NonNegative[d]=True;


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