Difference between revisions of "ApCoCoA-1:BB.BorderDivAlg"
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(Description update.) |
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<command> | <command> | ||
| − | + | <title>BB.BorderDivAlg</title> | |
| − | + | <short_description>Apply the border division algorithm.</short_description> | |
| − | <syntax> | + | <syntax>BB.BorderDivAlg(F:POLY,OO:LIST of POLY,Prebasis:LIST of POLY):RECORD |
| − | BB.BorderDivAlg(F:POLY,OO:LIST of POLY,Prebasis:LIST of POLY):RECORD | + | BB.BorderDivAlg(F:POLY,OO:LIST of POLY,Prebasis:LIST of LIST of POLY):RECORD</syntax> |
| − | BB.BorderDivAlg(F:POLY,OO:LIST of POLY,Prebasis:LIST of LIST of POLY):RECORD | + | <description> |
| − | </syntax> | ||
| − | |||
{{ApCoCoAServer}} | {{ApCoCoAServer}} | ||
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and <tt>Remainder</tt> sucht that <tt>Remainder</tt> is the normal <tt>OO</tt>-remainder. Please | and <tt>Remainder</tt> sucht that <tt>Remainder</tt> is the normal <tt>OO</tt>-remainder. Please | ||
note that you have to start the ApCoCoAServer in order to use this function. | note that you have to start the ApCoCoAServer in order to use this function. | ||
| − | + | <par/> | |
As it is not immediately clear which term in the support of a given prebasis polynomial of | As it is not immediately clear which term in the support of a given prebasis polynomial of | ||
<tt>Prebasis</tt> is contained in the border of <tt>OO</tt> (remember that a term ordering is | <tt>Prebasis</tt> is contained in the border of <tt>OO</tt> (remember that a term ordering is | ||
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------------------------------- | ------------------------------- | ||
</example> | </example> | ||
| − | + | </description> | |
| − | <types> | + | <types> |
| − | + | <type>poly</type> | |
| − | + | <type>polynomial</type> | |
| − | + | <type>list</type> | |
| − | + | <type>apcocoaserver</type> | |
| − | </types> | + | </types> |
| − | + | <see>DivAlg</see> | |
| − | + | <key>BorderDivAlg</key> | |
| − | + | <key>BB.BorderDivAlg</key> | |
| − | + | <key>borderbasis.BorderDivAlg</key> | |
| − | + | <wiki-category>Package_borderbasis</wiki-category> | |
</command> | </command> | ||
Revision as of 10:45, 24 April 2009
BB.BorderDivAlg
Apply the border division algorithm.
Syntax
BB.BorderDivAlg(F:POLY,OO:LIST of POLY,Prebasis:LIST of POLY):RECORD BB.BorderDivAlg(F:POLY,OO:LIST of POLY,Prebasis:LIST of LIST of POLY):RECORD
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.
Applies the Border Division Algorithm w.r.t. the order ideal OO and the border prebasis
Prebasis to the polynomial F and returns a record with fields Quotients
and Remainder sucht that Remainder is the normal OO-remainder. Please note that you have to start the ApCoCoAServer in order to use this function.
As it is not immediately clear which term in the support of a given prebasis polynomial of
Prebasis is contained in the border of OO (remember that a term ordering is
used automatically), the prebasis needs to be parsed internally and a more detailed prebasis representation is computed. The internal expansion will be skipped if you already pass a more detailed prebasis description to the function which is possible by using the second function call (see example below).
@param F The Border Division Algorithm will be applied to this polynomial.
@param OO A list of terms representing an order ideal.
@param Prebasis A list of polynomials representing a OO-border prebasis. Please see examples below for a detailed explanation of the format of this parameter.
@return The result of the Border Divison Algorithm will be stored in a record containing two fields "Quotients" and "Remainder", both of type POLY.
Example
Use QQ[x,y]; OO := [1, x, y]; Prebasis := [ x^2 + x + 1, xy + y, y^2 + x + 1 ]; F := x^3y^2 - xy^2 + x^2 + 2; BB.BorderDivAlg(F, OO, Prebasis); ------------------------------- Record[Quotients = [xy^2 - y^2 + 1, -y, 2], Remainder = -3x - 1] -------------------------------
Example
-- The paramter Prebasis is internally expanded to -- [ [ x^2 + x + 1, x^2 ], [ xy + y, xy ], [ y^2 + x + 1, y^2] ]. -- Thus, the following call of BB.BorderDivAlg is -- equivalent to the one above DetailedPrebasis := [ [ x^2 + x + 1, x^2 ], [ xy + y, xy ], [ y^2 + x + 1, y^2] ]; BB.BorderDivAlg(F, OO, DetailedPrebasis); ------------------------------- Record[Quotients = [xy^2 - y^2 + 1, -y, 2], Remainder = -3x - 1] -------------------------------
