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Re: [Axiom-math] Pointer update please.


From: Raymond Rogers
Subject: Re: [Axiom-math] Pointer update please.
Date: Mon, 01 Dec 2014 16:06:12 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0


On 12/01/2014 01:32 PM, Ralf Hemmecke wrote:
On 12/01/2014 05:24 PM, Raymond Rogers wrote:
I have been perusing information on Groebner basis in Axiom and some
links are broken in:

https://lists.gnu.org/archive/html/axiom-math/2006-08/msg00001.html

Bill Page
Subject:    RE: [Axiom-math] Groebernbases
Date:    Mon, 7 Aug 2006 11:37:42 -0400
In particular:

http://wiki.axiom-developer.org/axiom--test--1/src/algebra/PgrobnerSpad
http://wiki.axiom-developer.org/axiom--test--1/src/algebra/FrontPage/searchwiki?expr=Groebner
Could somebody provide updates for the links?
I cannot fix these links in the mailing list, but as far as I am
informed, the current place of the axiom-wiki is

http://axiom-wiki.newsynthesis.org
(maintained by Waldek Hebisch)

I don't know whether Tim maintains a copy of the old Wiki.

Anyway, your links probably translate into
http://axiom-wiki.newsynthesis.org/axiom--test--1/src/algebra/PgrobnerSpad
http://axiom-wiki.newsynthesis.org/axiom--test--1/src/algebra/FrontPage/searchwiki?expr=Groebner

You might also find this one useful (maintained by me).
http://fricas.github.io/api/PolyGroebner.html

Ralf

Since you are maintaining Groebner information, I have a question.
I wanted to convert quadratics p(x)->Q(x') by finding n,m: x'=m*x+n; so I put.
p(x)-q(x')=0
x'-m*x-n=0
and got an answer in terms f(n,m)x^2+g(n,m)*x+h(n,m)=0
so then I had to set
f(n,m)=0
g(n,m)=0
h(n,m)=0
as a separate step.  Which worked fine to give me triangular output.
I am questioning the second step; not that it's wrong, but IMO it
shouldn't be necessary.
Is there a technique to avoid that?  I haven't come up with anything.

Ray



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