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Re: Re: Trouble with FullSimplify

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98665] Re: [mg98632] Re: Trouble with FullSimplify
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Thu, 16 Apr 2009 04:11:12 -0400 (EDT)
  • References: <gphdse$omb$1@smc.vnet.net> <200904150857.EAA07824@smc.vnet.net>

On 15 Apr 2009, at 17:57, lehin.p 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.
>

Anyone who uses Simplify or FullSimplify with approximate numbers  
fully deserves the consequences.

Andrzej Kozlowski


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