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MathGroup Archive 2005

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Re: Simplify

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58689] Re: Simplify
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Thu, 14 Jul 2005 02:49:17 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 7/13/05 at 3:29 AM, paulvonhippel at yahoo.com (paulvonhippel at
yahoo) wrote:

>I'm having some trouble getting an expression to simplify in an
>obvious way. (There seems to be a long tradition of users posting
>to this group with similar troubles.)

>The expression is

> poly = p (p - 1) b^2 + s^2
> prod = Sqrt [poly] Sqrt[1/poly]
> Simplify[prod, {0 < p < 1, s > 0, bÅ?µReals}]

>which should return one, I think, but doesn't.

prod//PowerExpand will do what you want. However, you should be aware that the transformation done by PowerExpand is not valid in general which is why it is not one of the transformations used by Simplify or FullSimplify.
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