ApCoCoA-1:BB.BBasisForOI

From ApCoCoAWiki
Revision as of 12:20, 8 November 2007 by KHiddemann (talk | contribs)

borderbasis.BorderBasis

border basis of an ideal

Syntax

$borderbasis.BorderBasis(F:LIST,OO:LIST):LIST

Description

Computes the border basis of the ideal <formula>I=<F></formula> with respect to the order ideal OO. Gives an error messages if no border basis exists. Uses the <formula>O_{\sigma}(I)</formula> border basis and the border basis transformation algorithm. The inputs are a list of polynomials F and a list OO of terms that specify an order ideal. The output is a list of polynomials.

Example

Use Q[x,y];
$borderbasis.BorderBasis([x^2, xy + y^2], [1,x,y,y^2]);

[xy + y^2, x^2, y^3, xy^2]
-------------------------------

BBasis