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

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<command>
 
<command>
 
   <title>BB.LiftAS</title>
 
   <title>BB.LiftAS</title>
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     <type>ideal</type>
 
     <type>ideal</type>
 
   </types>
 
   </types>
   <see>BB.LiftASViaServer</see>
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   <see>ApCoCoA-1:BB.LiftASViaServer|BB.LiftASViaServer</see>
   <see>BB.LiftHomAS</see>
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   <see>ApCoCoA-1:BB.LiftHomAS|BB.LiftHomAS</see>
   <see>BB.LiftND</see>
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   <see>ApCoCoA-1:BB.LiftND|BB.LiftND</see>
   <see>BB.LiftNDViaServer</see>
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   <see>ApCoCoA-1:BB.LiftNDViaServer|BB.LiftNDViaServer</see>
   <see>BB.LiftHomND</see>
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   <see>ApCoCoA-1:BB.LiftHomND|BB.LiftHomND</see>
  
 
   <key>LiftAS</key>
 
   <key>LiftAS</key>
 
   <key>BB.LiftAS</key>
 
   <key>BB.LiftAS</key>
 
   <key>borderbasis.LiftAS</key>
 
   <key>borderbasis.LiftAS</key>
   <wiki-category>Package_borderbasis</wiki-category>
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   <wiki-category>ApCoCoA-1:Package_borderbasis</wiki-category>
 
</command>
 
</command>

Latest revision as of 09:41, 7 October 2020

This article is about a function from ApCoCoA-1.

BB.LiftAS

Computes the border basis scheme ideal generators obtained from lifting of AS neighbours.

Syntax

BB.LiftAS(OO:LIST):LIST

Description

This command computes the generators of the border basis scheme ideal I(B_O) that result from the lifting of across-the-street neighbours.

  • @param OO A list of terms representing an order ideal with second element of type POLY.

  • @return A list of generators of the border basis scheme ideal. The polynomials will belong to the ring BBS=K[c_{ij}].

Example

Use QQ[x,y], DegRevLex;
BB.LiftAS([Poly(1), x, y, xy]);

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

BB.LiftASViaServer

BB.LiftHomAS

BB.LiftND

BB.LiftNDViaServer

BB.LiftHomND