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MathGroup Archive 2004

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Re: Reduce[] in version 5.1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52755] Re: Reduce[] in version 5.1
  • From: "Frank Kampas" <fkampas at verizon.net>
  • Date: Sat, 11 Dec 2004 05:23:10 -0500 (EST)
  • References: <cpau38$iki$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Use the Reduce option Backsubstitution -> True

"Gianluca Gorni" <gorni at dimi.uniud.it> wrote in message 
news:cpau38$iki$1 at smc.vnet.net...
>
> 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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