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;