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MathGroup Archive 2004

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Re: Algebraic Manipulation

  • To: mathgroup at
  • Subject: [mg46172] Re: Algebraic Manipulation
  • From: bobhanlon at (Bob Hanlon)
  • Date: Tue, 10 Feb 2004 00:05:39 -0500 (EST)
  • References: <c07p9h$kmc$>
  • Sender: owner-wri-mathgroup at


Simplify[expr, r^2==x^2+y^2+z^2]

(k*x*y)/(r^2*(k + r))

Bob Hanlon

In article <c07p9h$kmc$1 at>, "David Park" <djmp at>

<< expr = x*y*(-(z^2/(r^2*(x^2 + y^2))) - 1/(r*(k + r)) + 1/(x^2 + y^2))


r^2 == x^2 + y^2 + z^2

reduces to

(k*x*y)/(r^2*(k + r))

I wonder if anyone can show an elegant or short method to do the

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