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Re: [Cado-nfs-discuss] FactorBaseFormat


Chronological Thread 
  • From: Pankaj Charpe <charpe.pankajamol@gmail.com>
  • To: Pierrick Gaudry <Pierrick.Gaudry@loria.fr>
  • Cc: cado-nfs-discuss@lists.gforge.inria.fr
  • Subject: Re: [Cado-nfs-discuss] FactorBaseFormat
  • Date: Tue, 6 Feb 2018 19:32:40 +0530
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Thanks, I'll check it out.  

-pankqj

On Feb 6, 2018 7:03 PM, "Pierrick Gaudry" <pierrick.gaudry@loria.fr> wrote:
Hi,

The full story is computing the maximal order of a number (or function)
field, which is closely related to factoring polynomials over p-adic
numbers (or power series).

This is covered, for instance, in Chapter 6 of Cohen's book "A course in
computational algrebraic number theory". In Cado-nfs 2.3, this is
implemented in the numbertheory/ subdirectory.

However, for makefb, only a very partial information is sufficient, so
that a simpler Hensel-like procedure is used. For this part, as far as I
know there is no article or book describing it. The sage source:
  sieve/makefb.sage
might be easier to understand than the C code. But in the end, the main
keyword is: Hensel. You know what's going on modulo p^k and compute what
it yields modulo p^{k+1} until you reach some regular pattern.

Regards,
Pierrick

On Mon, Feb 05, 2018 at 04:31:01PM +0530, Pankaj Charpe wrote:
> can you please provide a link to any reference paper to study this?  It
> will be very helpful to me.
>
> -pankaj




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