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

From ApCoCoAWiki
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</example>
 
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     </description>
 
     </description>
    <key>kreuzer</key>
 
    <key>bb.lifthomnd</key>
 
    <key>borderbasis.lifthomnd</key>
 
 
     <see>BB.LiftAS</see>
 
     <see>BB.LiftAS</see>
 
     <see>BB.LiftASViaServer</see>
 
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     <see>BB.LiftND</see>
 
     <see>BB.LiftND</see>
 
     <see>BB.LiftNDViaServer</see>
 
     <see>BB.LiftNDViaServer</see>
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    <key>LiftHomND</key>
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    <key>BB.LiftHomND</key>
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    <key>borderbasis.LiftHomND</key>
 
     <wiki-category>Package_borderbasis</wiki-category>
 
     <wiki-category>Package_borderbasis</wiki-category>
 
</command>
 
</command>

Revision as of 18:54, 22 April 2009

BB.LiftHomND

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

Syntax

BB.LiftHomND(OO:LIST):LIST

Description

Computes the generators of the border basis scheme ideal <formula>I(\mathbb{B}^{\textrm{hom}}_\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 homogeneous 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,z], DegRevLex;
BB.LiftHomND([Poly(1), x, y, xy]);

[BBS :: c[3,1]c[4,4] + c[2,1] - c[4,2],
 BBS :: c[2,1]c[4,5] + c[3,1] - c[4,3]]
-------------------------------

BB.LiftAS

BB.LiftASViaServer

BB.LiftHomAS

BB.LiftND

BB.LiftNDViaServer