Re: Reduce[] in version 5.1
- To: mathgroup at smc.vnet.net
- Subject: [mg52721] Re: [mg52678] Reduce[] in version 5.1
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Sat, 11 Dec 2004 05:21:14 -0500 (EST)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
Use LogicalExpand
Reduce[{x^2 - y == 2, x + y == 0}, {x, y}]//LogicalExpand
(x == -2 && y == -x) || (x == 1 && y == -x)
Bob Hanlon
>
> From: Gianluca Gorni <gorni at dimi.uniud.it>
To: mathgroup at smc.vnet.net
> Date: 2004/12/09 Thu PM 08:22:28 EST
> To: mathgroup at smc.vnet.net
> Subject: [mg52721] [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
>
>