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MathGroup Archive 2002

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Re: FullSimplify doesn't simplify

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32775] Re: FullSimplify doesn't simplify
  • From: Steve Luttrell <luttrell at signal.qinetiq.com>
  • Date: Sat, 9 Feb 2002 05:11:48 -0500 (EST)
  • Organization: QinetiQ
  • References: <a404nb$bqk$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Try this one, which gives the result {Sqrt[6], -Sqrt[6]}:

{(x y)^n, x^n y^n} /. {x -> -2, y -> -3, n -> 1/2}

The two expressions evaluate to different results because fractional
powers have multiple values. 


On the other hand the following gives the result True, because you
explicitly state that n is an integer (i.e. not a fractional) power: 

Simplify[(x y)^n == x^n y^n, n \[Element] Integers]



Steve Luttrell


"Ken Morgan" <kmorga51 at calvin.edu> wrote in
news:a404nb$bqk$1 at smc.vnet.net: 

> Does anyone know why Mathematica doesn't simplify the following to
> True? 
> 
> 
> In[1] := FullSimplify[(x y)^n == (x^n)(y^n)]
> 
> Out[1] := (x y)^n == (x^n)(y^n)
> 
> Are there cases where this is not true?


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