Difference between revisions of "ApCoCoA-1:FGLM.FGLM"

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{{Version|1}}
 
<command>
 
<command>
 
   <title>FGLM.FGLM</title>
 
   <title>FGLM.FGLM</title>
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the given Groebner Basis must be zero-dimensional. The Groebner
 
the given Groebner Basis must be zero-dimensional. The Groebner
 
Basis contained in list GBInput will be converted into a Groebner
 
Basis contained in list GBInput will be converted into a Groebner
Basis with respect to term ordering <ref>Ord</ref>(M), i.e. M must be a matrix
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Basis with respect to term ordering <ref>ApCoCoA-1:Ord|Ord</ref>(M), i.e. M must be a matrix
 
specifying a term ordering. If the parameter M is not specified, ApCoCoA
 
specifying a term ordering. If the parameter M is not specified, ApCoCoA
will assume M = <ref>Ord</ref>(). Please note that the resulting polynomials belong
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will assume M = <ref>ApCoCoA-1:Ord|Ord</ref>(). Please note that the resulting polynomials belong
 
to a different ring than the ones in GBInput.
 
to a different ring than the ones in GBInput.
 
<par/>
 
<par/>
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<itemize>
 
<itemize>
 
   <item>@param <em>GBInput</em> A Groebner basis of a zero-dimensional ideal.</item>
 
   <item>@param <em>GBInput</em> A Groebner basis of a zero-dimensional ideal.</item>
   <item>@return A Groebner basis of the ideal generated by the polynomials of GBInput. The polynomials of the new Groebner basis will belong to the polynomial ring with term ordering specified by <tt>M</tt> or <ref>Ord</ref>() in case M is not given.</item>
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   <item>@return A Groebner basis of the ideal generated by the polynomials of GBInput. The polynomials of the new Groebner basis will belong to the polynomial ring with term ordering specified by <tt>M</tt> or <ref>ApCoCoA-1:Ord|Ord</ref>() in case M is not given.</item>
 
</itemize>
 
</itemize>
 
The following parameter is optional.
 
The following parameter is optional.
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-- New basis (Lex)
 
-- New basis (Lex)
 
BringIn(GBNew);
 
BringIn(GBNew);
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-------------------------------
 
-------------------------------
 
[z^6 - z^5 - 4z^4 - 2z^3 + 1, y - 4/7z^5 + 5/7z^4 + 13/7z^3 + 10/7z^2 - 6/7z - 2/7,
 
[z^6 - z^5 - 4z^4 - 2z^3 + 1, y - 4/7z^5 + 5/7z^4 + 13/7z^3 + 10/7z^2 - 6/7z - 2/7,
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</example>
 
</example>
 
   </description>
 
   </description>
   <see>GBasis5, and more</see>
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   <see>ApCoCoA-1:GBasis5, and more|GBasis5, and more</see>
   <see>Introduction to CoCoAServer</see>
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   <see>ApCoCoA-1:Introduction to CoCoAServer|Introduction to CoCoAServer</see>
 
   <types>
 
   <types>
 
     <type>groebner</type>
 
     <type>groebner</type>
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   <key>fglm.FGLM</key>
 
   <key>fglm.FGLM</key>
 
   <key>groebner basis conversion</key>
 
   <key>groebner basis conversion</key>
   <wiki-category>Package_fglm</wiki-category>
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   <wiki-category>ApCoCoA-1:Package_fglm</wiki-category>
 
</command>
 
</command>

Latest revision as of 10:00, 7 October 2020

This article is about a function from ApCoCoA-1.

FGLM.FGLM

Performs a FGLM Groebner Basis conversion using ApCoCoAServer.

Syntax

FGLM(GBInput:LIST, M:MAT):LIST
FGLM(GBInput:LIST):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.

The function FGLM calls the ApCoCoAServer to perform a

FGLM Groebner Basis conversion. Please note that the ideal generated by

the given Groebner Basis must be zero-dimensional. The Groebner Basis contained in list GBInput will be converted into a Groebner Basis with respect to term ordering Ord(M), i.e. M must be a matrix specifying a term ordering. If the parameter M is not specified, ApCoCoA will assume M = Ord(). Please note that the resulting polynomials belong to a different ring than the ones in GBInput.

The return value will be the transformed Groebner basis polynomials.

  • @param GBInput A Groebner basis of a zero-dimensional ideal.

  • @return A Groebner basis of the ideal generated by the polynomials of GBInput. The polynomials of the new Groebner basis will belong to the polynomial ring with term ordering specified by M or Ord() in case M is not given.

The following parameter is optional.

  • @param M A matrix representing a term ordering.

Example

Use QQ[x, y, z], DegRevLex;
GBInput := [z^4 -3z^3 - 4yz + 2z^2 - y + 2z - 2, yz^2 + 2yz - 2z^2 + 1, y^2 - 2yz + z^2 - z, x + y - z];
M := LexMat(3);
GBNew := FGLM.FGLM(GBInput, M);
Use QQ[x, y, z], Ord(M);
-- New basis (Lex)
BringIn(GBNew);

-------------------------------
[z^6 - z^5 - 4z^4 - 2z^3 + 1, y - 4/7z^5 + 5/7z^4 + 13/7z^3 + 10/7z^2 - 6/7z - 2/7,
 x + 4/7z^5 - 5/7z^4 - 13/7z^3 - 10/7z^2 - 1/7z + 2/7]
-------------------------------

GBasis5, and more

Introduction to CoCoAServer