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Re: a simplification problem

  • To: mathgroup at
  • Subject: [mg55257] Re: a simplification problem
  • From: Bill Rowe <readnewsciv at>
  • Date: Thu, 17 Mar 2005 03:30:56 -0500 (EST)
  • Sender: owner-wri-mathgroup at

On 3/16/05 at 5:35 AM, fangh73 at (Hui Fang) wrote:

>My questions is simple: How do I simplify (-1)^(1/3) to -1?

On one level the answer is you don't since

{(-1)^3,(1/2 + I Sqrt[3]/2)^3,(1/2 - I Sqrt[3]/2)^3}//Simplify


{-1, -1, -1}

But if you want to force Mathematica to get a real cube root of a negative number, load the package Miscellaneous`RealOnly`
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