Difference between revisions of "ApCoCoA-1:BB.ASgens"
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Revision as of 15:38, 2 October 2020
BB.ASgens
Computes the generators of the vanishing ideal of a border basis scheme.
Syntax
BB.ASgens(K:INT,OO:LIST):LIST
Description
This command computes the generators of the vanishing ideal of the border basis scheme corresponding to the lifting of the K-th element of the list returned by BB.ASneighbors(OO).
@param K An integer in the range 1..Len(BB.ASneighbors(OO)).
@param OO A list of terms representing an order ideal.
@return A list of generators of the vanishing ideal. The polynomials will belong to the ring BBS=K[c_{ij}].
Example
Use QQ[x,y,z]; BB.ASgens(1, [1,x,y,z]); [BBS :: c[1,5]c[2,1] - c[1,3]c[2,2] + c[1,4]c[3,1] - c[1,2]c[3,2] + c[1,2]c[4,1] - c[1,1]c[4,2], BBS :: c[2,2]c[2,3] - c[2,1]c[2,5] - c[2,4]c[3,1] + c[2,2]c[3,2] - c[2,2]c[4,1] + c[2,1]c[4,2], BBS :: c[3,2]^2 + c[2,2]c[3,3] - c[3,1]c[3,4] - c[2,1]c[3,5] - c[3,2]c[4,1] + c[3,1]c[4,2] - c[1,1], BBS :: c[3,2]c[4,2] + c[2,2]c[4,3] - c[3,1]c[4,4] - c[2,1]c[4,5] + c[1,2]] -------------------------------
