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MathGroup Archive 2001

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Re: Re: Factor[1+x^4]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg27151] Re: [mg26889] Re: Factor[1+x^4]
  • From: "Allan Hayes" <hay at haystack.demon.co.uk>
  • Date: Thu, 8 Feb 2001 04:40:40 -0500 (EST)
  • References: <95qt1m$t0h@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Gianluca,

> Regarding Factor with Extension, there is a bug
> in version 4.0 for PowerMacintosh:
>
> Factor[1 + 2 z^4, Extension -> {Sqrt[-2]/3}] // Expand
>
> (1/9) + 2 z^4


It's OK in 4.1

Factor[1+2 z^4,Extension\[Rule]{Sqrt[-2]/3}]//Expand

        1 + 2*z^4

--
Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565

"Gianluca Gorni" <gorni at dimi.uniud.it> wrote in message
news:95qt1m$t0h at smc.vnet.net...
>
> Regarding Factor with Extension, there is a bug
> in version 4.0 for PowerMacintosh:
>
> Factor[1 + 2 z^4, Extension -> {Sqrt[-2]/3}] // Expand
>
> (1/9) + 2 z^4
>
> I cannot say if the bug is still there in version 4.1,
> because I am still waiting for the upgrade (I am a
> Premier Service subscriber, but out of the U.S.)
>
> Best regards,
>
>                Gianluca Gorni
>
>
> --
>
>
>  +---------------------------------+
>  | Gianluca Gorni                  |
>  | Universita` di Udine            |
>  | Dipartimento di Matematica      |
>  |   e Informatica                 |
>  | via delle Scienze 208           |
>  | I-33100 Udine UD                |
>  | Italy                           |
>  +---------------------------------+
>  | Ph.: (39) 0432-558422           |
>  | Fax: (39) 0432-558499           |
>  | mailto:gorni at dimi.uniud.it      |
>  | http://www.dimi.uniud.it/~gorni |
>  +---------------------------------+
>
>
>




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