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 > >