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Re: Solve...or not

  • To: mathgroup at smc.vnet.net
  • Subject: [mg128551] Re: Solve...or not
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Fri, 2 Nov 2012 00:46:46 -0400 (EDT)
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  • References: <20121101072008.AE953687B@smc.vnet.net>

On Nov 1, 2012, at 3:20 AM, "Harker, Anthony" <a.harker at ucl.ac.uk> wrote:

> I've seen some discussion of Version 8's Solve[] in this group, but have I missed something explaining this?
>
>  I have the following behaviour (both under Windows 7)
>
> Mathematica 8.0.1.0
>
> Solve[{(y-2)/(x-1)==1,y==0},x]
> {}
>
> Mathematica 7.0.1.0
> Solve[{(y-2)/(x-1)==1,y==0},x]
> {{x->-1}}


You'll see same, empty, result with the currently shipping version, Mathematica 8.0.4. The platform is irrelevant; at least you'll see the same thing with Mac OS X, and undoubtedly under Linux as well.

You may use any of the following instead:

  Solve[{(y - 2)/(x - 1) == 1, y == 0}, {x, y}]

  Solve[{(y - 2)/(x - 1) == 1, y == 0}, x, MaxExtraConditions -> All]

  Reduce[{(y - 2)/(x - 1) == 1, y == 0}, x]
  Reduce[{(y - 2)/(x - 1) == 1, y == 0}, {x, y}]

---
Murray Eisenberg                           murray at math.umass.edu
Mathematics & Statistics Dept.      
Lederle Graduate Research Tower            phone 413 549-1020 (H)
University of Massachusetts                      413 545-2838 (W)
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Amherst, MA 01003-9305








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