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MathGroup Archive 2004

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Re : Reduce[] in version 5.1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52725] Re : [mg52678] Reduce[] in version 5.1
  • From: "Jaccard Florian" <Florian.Jaccard at he-arc.ch>
  • Date: Sat, 11 Dec 2004 05:21:20 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello !

Write :

In[9]:=
Reduce[{x^2 - y == 2, x + y == 0}, {x, y}, 
  Backsubstitution -> True]

Out[9]=
x == -2 && y == 2 || x == 1 && y == -1

F.Jaccard


-----Message d'origine-----
De : Gianluca Gorni [mailto:gorni at dimi.uniud.it] 
Envoyé : vendredi, 10. décembre 2004 02:22
À : mathgroup at smc.vnet.net
Objet : [mg52678] Reduce[] in version 5.1


Hello!

In Mathematica 5.1 I get the following result from Reduce:

Reduce[{x^2 - y == 2, x + y == 0}, {x, y}]

(x == -2 || x == 1) && y == -x

Sincerely, I preferred the output of version 4.2:

x==-2 && y==2 || x==1 && y==-1

To recover this good old form in 5.1 I have to Reduce[] twice:

Reduce[Reduce[{x^2 - y == 2, x + y == 0}, {x, y}]]

I think wri should work on this for the next version.

Best regards,

Gianluca Gorni


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