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MathGroup Archive 2005

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Re: Bug in Reduce?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60431] Re: [mg60406] Bug in Reduce?
  • From: "benshimo at bgumail.bgu.ac.il" <bsyehuda at gmail.com>
  • Date: Fri, 16 Sep 2005 03:49:16 -0400 (EDT)
  • References: <dfrhi4$g4l$1@smc.vnet.net> <dg8lfv$r8g$1@smc.vnet.net> <200509140926.FAA01590@smc.vnet.net> <200509150916.FAA15875@smc.vnet.net>
  • Reply-to: benshimo at bgumail.bgu.ac.il
  • Sender: owner-wri-mathgroup at wolfram.com

In version 5.2 it returns
(a == 0 && b == 0) || (c == 0 && d == 0)
yehuda

On 9/15/05, Kennedy <jack at realmode.com> wrote:
>
> The source of this apparent bug could be my misunderstanding of the
> middle,
> "vars" parameter of Reduce, but it sure seems like the following output
> indicates that c must be 0 for my two equations to be satisfied, when in
> fact if a and b are both 0, c does not need to be 0.
>
> Regards,
> Jack
>
> In[1]:=
> Reduce[{a c - b d == 0, a d + b c == 0}, {a, b, c, d}, Reals] //
> FullSimplify
>
> Out[1]=
> c == 0 && (d == 0 || (a == 0 && b == 0))
>
> (version 5.1 for Windows)
>
>



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