Re: Q: Factor with Polynominals?

• To: mathgroup at smc.vnet.net
• Subject: [mg26700] Re: Q: Factor with Polynominals?
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Thu, 18 Jan 2001 00:57:09 -0500 (EST)
• Organization: Universitaet Leipzig
• References: <943d4e\$chm@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Hi,

witch one of the printed forms in:

3 x^2 + 3 y^2 + x + y^3 + y x^2 /.
a__ + b__ /; ( Print[a + Factor[Plus[b]]]; False) :> "never come here"

???

Ok. Lets take the LeafCount[] to choose the most simple case

lst = {};
3 x^2 + 3 y^2 + x + y^3 + y x^2 /.
a__ + b__ /; ( AppendTo[lst, a + Factor[Plus[b]]]; False) :> "also
never come here";
Last[First[Sort[{LeafCount[#], #} & /@ lst, First[#1] < First[#2] &]]]

Regards
Jens

Robert wrote:
>
> hello!
> i'd like to factor polynominals, e. g. if i have an exspression like
>
> 3 x^2 + 3 y^2 + x + y^3 + y x^2,
>
> i'd like to get (i want to factor x^2+y^2):
>
> (x^2+y^2)  (3 + y) + x.
>
> how can i achieve a result like this (also with other, more complicated
> polynominals)?
>
> thanks, robert

```

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