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Simplify results

  • To: mathgroup at smc.vnet.net
  • Subject: [mg118264] Simplify results
  • From: "Berthold Hamburger" <b-hamburger at artinso.com>
  • Date: Tue, 19 Apr 2011 06:56:29 -0400 (EDT)

Hi,

This might be a silly question, so please bear with me, but I have been
scratching my head about it for some time now.

Is there a particular reason why Mathematica (8.01) simplifies the following
fraction reversing the signs in the result:

IN:

Simplify[(8a^2b^3(c^2+1)^4-6a^3b^2(c^2+1)^3+14a^4b
(c^2+1)^2)/(4a^3b^2(c^2+1)^2-10a^4b^3(c^2+1)^3)]

OUT:

(-7 a^2+3 a b (1+c^2)-4 b^2 (1+c^2)^2)/(a b (-2+5 a b (1+c^2)))

Reducing the fraction by hand gives me:

(7 a^2-3 a b (1+c^2)+4 b^2 (1+c^2)^2)/(a b (2-5 a b (1+c^2)))

Thanks

Berthold

-- 

Berthold Hamburger - Cellist/Spain

Email: behambu at artinso.com

http://www.artinso.com

http://www.astronomy.artinso.com


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