# Difference between revisions of "ApCoCoA-1:BB.LiftASViaServer"

Line 9: | Line 9: | ||

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

<par/> | <par/> | ||

− | If <tt>HomogeneousLift</tt> is set to <tt> | + | If <tt>HomogeneousLift</tt> is set to <tt>FALSE</tt>, the generators of the border basis scheme ideal <tt>I(B_O)</tt> that result from the lifting of across-the-street neighbors will be computed by using the ApCoCoAServer. If <tt>HomogeneousLift</tt> is set to <tt>TRUE</tt>, generators of <tt>I(B^hom_O)</tt> will be computed instead. |

<itemize> | <itemize> | ||

<item>@param <em>OO</em> A list of terms representing an order ideal.</item> | <item>@param <em>OO</em> A list of terms representing an order ideal.</item> | ||

− | <item>@param <em>Border</em> A list of terms representing the border of | + | <item>@param <em>Border</em> A list of terms representing the border of order ideal.</item> |

<item>@param <em>Homogeneous</em> Set to <em>TRUE</em> if you want to compute the generators of the homogeneous border basis scheme.</item> | <item>@param <em>Homogeneous</em> Set to <em>TRUE</em> if you want to compute the generators of the homogeneous border basis scheme.</item> | ||

− | <item>@return A list of generators of the border basis scheme ideal | + | <item>@return A list of generators of the border basis scheme ideal. The polynomials will belong to the ring BBS=K[c_{ij}].</item> |

</itemize> | </itemize> | ||

<example> | <example> |

## Revision as of 15:36, 8 July 2009

## BB.LiftASViaServer

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

### Syntax

BB.LiftASViaServer(OO:LIST,Border:LIST,HomogeneousLift:BOOL):LIST

### 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.

If `HomogeneousLift` is set to `FALSE`, the generators of the border basis scheme ideal `I(B_O)` that result from the lifting of across-the-street neighbors will be computed by using the ApCoCoAServer. If `HomogeneousLift` is set to `TRUE`, generators of `I(B^hom_O)` will be computed instead.

@param

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

*Border*A list of terms representing the border of order ideal.@param

*Homogeneous*Set to*TRUE*if you want to compute the generators of the homogeneous border basis scheme.@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.LiftASViaServer([Poly(1), x, y, xy], [y^2, x^2, xy^2, x^2y], False); ------------------------------- [BBS :: c[3,4]c[4,1] - c[2,3]c[4,2] + c[2,4] - c[3,3], 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[1,2]c[2,3] + c[1,1]c[3,4] - c[1,4]c[4,3] + c[1,3]c[4,4]] -------------------------------