Groups > comp.soft-sys.math.mathematica > #1783

Simplify results

From	"Berthold Hamburger" <b-hamburger@artinso.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Simplify results
Date	2011-04-19 10:56 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<iojpot$i4q$1@smc.vnet.net> (permalink)

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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@artinso.com

http://www.artinso.com

http://www.astronomy.artinso.com

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Simplify results "Berthold Hamburger" <b-hamburger@artinso.com> - 2011-04-19 10:56 +0000
  Re: Simplify results "Sjoerd C. de Vries" <sjoerd.c.devries@gmail.com> - 2011-04-20 08:28 +0000
  Re: Simplify results Gary Wardall <gwardall@gmail.com> - 2011-04-20 08:29 +0000

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