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

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  • Subject: [mg8302] Simplifying Sqrt[a^2*d^2] -> a*d
  • From: carlos at mars.Colorado.EDU (Carlos A. Felippa)
  • Date: Sun, 24 Aug 1997 04:46:47 -0400
  • Sender: owner-wri-mathgroup at

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.

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