MathGroup Archive: November 2002 [00079]

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Re: Reversing PowerExpand

To: mathgroup at smc.vnet.net
Subject: [mg37565] Re: Reversing PowerExpand
From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
Date: Tue, 5 Nov 2002 05:00:11 -0500 (EST)
Organization: Universitaet Leipzig
References: <aq0379$4nd$1@smc.vnet.net>
Reply-to: kuska at informatik.uni-leipzig.de
Sender: owner-wri-mathgroup at wolfram.com

Hi,

Sqrt[x] Sqrt[y] /. c_.*Power[a_, n_]*Power[b_, n_] :> c*Power[a*b, n]

But be carefull when x and y are complex.

Regards
  Jens

Dave Snead wrote:
> 
> I can use PowerExpand to go from
> 
> Sqrt[x y] to Sqrt[x] Sqrt[y]
> 
> How do I reverse this and go from
> 
> Sqrt[x] Sqrt[y] to Sqrt[x y]
> 
> Thanks in advance.
> --Dave Snead

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