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

From ApCoCoAWiki
(Added parameter and return value list.)
(Key and see section update.)
Line 26: Line 26:
 
</example>
 
</example>
 
     </description>
 
     </description>
    <key>kreuzer</key>
 
    <key>bb.liftnd</key>
 
    <key>borderbasis.liftnd</key>
 
 
     <see>BB.LiftAS</see>
 
     <see>BB.LiftAS</see>
 
     <see>BB.LiftASViaServer</see>
 
     <see>BB.LiftASViaServer</see>
Line 34: Line 31:
 
     <see>BB.LiftNDViaServer</see>
 
     <see>BB.LiftNDViaServer</see>
 
     <see>BB.LiftHomND</see>
 
     <see>BB.LiftHomND</see>
 +
    <key>LiftND</key>
 +
    <key>BB.LiftND</key>
 +
    <key>borderbasis.LiftND</key>
 
     <wiki-category>Package_borderbasis</wiki-category>
 
     <wiki-category>Package_borderbasis</wiki-category>
 
</command>
 
</command>

Revision as of 18:53, 22 April 2009

BB.LiftND

Compute the border basis scheme ideal generators obtained from lifting of ND neighbors.

Syntax

BB.LiftND(OO:LIST):LIST

Description

Computes the generators of the border basis scheme ideal <formula>I(\mathbb{B}_\mathcal{O})</formula> that result from the lifting of next-door neighbors. The input is a list of terms OO (2nd element of type POLY). The output is a list of poly in the ring <formula>BBS=K[c_{ij}]</formula>.

  • @param OO A list of terms representing an order ideal.

  • @return A list of generators of the border basis scheme ideal I(B_O) that results from the lifting of next-door neighbors in the border of OO. The polynomials will belong to the ring BBS=K[c_{ij}].

Example

Use Q[x,y], DegRevLex;
BB.LiftND([Poly(1), x, y, xy]);

[BBS :: c[1,2]c[2,1] + c[1,4]c[4,1] - c[1,3],
 BBS :: c[2,1]c[2,2] + c[2,4]c[4,1] + c[1,1] - c[2,3],
 BBS :: c[2,1]c[3,2] + c[3,4]c[4,1] - c[3,3],
 BBS :: c[2,1]c[4,2] + c[4,1]c[4,4] + c[3,1] - c[4,3],
 BBS :: c[1,1]c[3,2] + c[1,3]c[4,2] - c[1,4],
 BBS :: c[2,1]c[3,2] + c[2,3]c[4,2] - c[2,4],
 BBS :: c[3,1]c[3,2] + c[3,3]c[4,2] + c[1,2] - c[3,4],
 BBS :: c[3,2]c[4,1] + c[4,2]c[4,3] + c[2,2] - c[4,4]]
-------------------------------

BB.LiftAS

BB.LiftASViaServer

BB.LiftHomAS

BB.LiftNDViaServer

BB.LiftHomND