Difference between revisions of "ApCoCoA-1:BB.BBasis"

From ApCoCoAWiki
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</example>
 
</example>
 
   </description>
 
   </description>
 +
  <see>Introduction to CoCoAServer</see>
 
   <see>GBasis5, and more</see>
 
   <see>GBasis5, and more</see>
 
   <see>BB.BBasisForOI</see>
 
   <see>BB.BBasisForOI</see>
 
   <types>
 
   <types>
 
     <type>borderbasis</type>
 
     <type>borderbasis</type>
 +
    <type>ideal</type>
 
     <type>apcocoaserver</type>
 
     <type>apcocoaserver</type>
 
   </types>
 
   </types>

Revision as of 13:36, 24 April 2009

BB.BBasis

Compute the border basis of a zero-dimensional ideal.

Syntax

BB.BBasis(I:IDEAL):LIST of POLY

Description

Please note: The function(s) explained on this page is/are using the ApCoCoAServer. You will have to start the ApCoCoAServer in order to use it/them.

Let sigma be a degree compatible term ordering. The function BBasis calls the ApCoCoAServer to compute the O_sigma(I)-border basis of the zero-dimensional input ideal I and returns it as a list of polynomials.

The return value will be the computed border basis.

  • @param I A zero-dimensional ideal of which to compute a border basis.

  • @return A list of border basis polynomials.

Example

Use QQ[x, y], DegLex;
I := Ideal([x^2, xy + y^2]);
BB := BBasis(I);
BB;

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

Introduction to CoCoAServer

GBasis5, and more

BB.BBasisForOI