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Re: Trouble with FullSimplify

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98694] Re: Trouble with FullSimplify
  • From: Szabolcs <szhorvat at gmail.com>
  • Date: Thu, 16 Apr 2009 04:16:30 -0400 (EDT)
  • References: <gphdse$omb$1@smc.vnet.net> <gs47h2$7ka$1@smc.vnet.net>

On Apr 15, 11:57 am, lehi... at gmail.com wrote:
> On 15 =DC=D0=E0, 03:16, JUN <noec... at gmail.com> wrote:
>
> > What is wrong with the following in Mathematica 7:
>
> > Clear[n];
> > FullSimplify[n Exp[-n * 0.], Element[n, Integers]]
>
> > result: n/2, which is scary. If I replace 0. by $MachineEpsilon/2, I
> > get a correct result.
>
> > It's also fun to express your feelings about Mathematica 7 this way:
> > FullSimplify[$Version Exp[$Version *($VersionNumber -
> > $VersionNumber)]]
>
> > Jens
>
> This is a terrible bug. I am very much disappointed with Simplify and
> even more with FullSimplify functions in Mathematica 6 and worse in
> Mathematica 7.

OK, so what exactly is it that's broken in Simplify in version 7 (and
not in version 6), *apart* from this specific bug?  What is it that's
broken in 6 too?

It sounds like you've found other problems, so please post your
examples in this thread.


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