Difference between revisions of "ApCoCoA-1:Weyl.WRedGB"

From ApCoCoAWiki
(New page: <command> <title>Weyl.WRedGB</title> <short_description>Computes reduced Groebner basis of a D-ideal in Weyl algebra <tt>A_n</tt>.</short_description> <syntax> Weyl.WRedGB(GB:LIS...)
 
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</syntax>
 
</syntax>
 
     <description>
 
     <description>
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This function converts Groebner basis <tt>GB</tt> computed by ApCoCoAServer into the reduced Groebner Basis. If <tt>GB</tt> is not a Groebner basis then the output will not be the reduced Groebner basis. In fact, this function reduces a list <tt>GB</tt> of Weyl polynomials using <ref>Weyl.WNR</ref> into a new list <tt>L</tt> such that <tt>Ideal(L) = Ideal(GB)</tt>.
 +
This function is replaced by the function <ref>Weyl.WRGB</ref> inside the function <ref>Weyl.WGB</ref> to get a list of minimal Groebner basis elements for the ideal <tt>I</tt>.
 
<par/>
 
<par/>
This function converts Groebner basis <tt>GB</tt> computed by ApCoCoAServer into the reduced Groebner Basis. If <tt>GB</tt> is not a Groebner basis then the output will not be the reduced Groebner basis. In fact, this function reduces a list <tt>GB</tt> of Weyl polynomials using <ref>Weyl.WNR</ref> into a new list L such that Ideal(L) = Ideal(GB).
+
<em>Note:</em> This function is faster than <ref>Weyl.WRGB</ref> for a list <tt>GB</tt> of large size.
This function is replaced by the function <ref>Weyl.WRGB</ref> inside the function <ref>Weyl.WGB</ref> to get a list of minimal Groebner basis elements for the ideal I.
 
Note: This function is faster than <ref>Weyl.WRGB</ref> for a list GB of large size.
 
 
<itemize>
 
<itemize>
 
<item>@param <em>GB</em> Groebner Basis of an ideal in the Weyl algebra.</item>
 
<item>@param <em>GB</em> Groebner Basis of an ideal in the Weyl algebra.</item>
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       <type>groebner</type>
 
       <type>groebner</type>
 
     </types>
 
     </types>
     <key>weyl.wrgb</key>
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     <key>weyl.wredgb</key>
     <key>wrgb</key>
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     <key>wredgb</key>
 
     <wiki-category>Package_weyl</wiki-category>
 
     <wiki-category>Package_weyl</wiki-category>
 
   </command>
 
   </command>

Revision as of 15:56, 14 October 2009

Weyl.WRedGB

Computes reduced Groebner basis of a D-ideal in Weyl algebra A_n.

Syntax

Weyl.WRedGB(GB:LIST):LIST

Description

This function converts Groebner basis GB computed by ApCoCoAServer into the reduced Groebner Basis. If GB is not a Groebner basis then the output will not be the reduced Groebner basis. In fact, this function reduces a list GB of Weyl polynomials using Weyl.WNR into a new list L such that Ideal(L) = Ideal(GB).

This function is replaced by the function Weyl.WRGB inside the function Weyl.WGB to get a list of minimal Groebner basis elements for the ideal I.

Note: This function is faster than Weyl.WRGB for a list GB of large size.

  • @param GB Groebner Basis of an ideal in the Weyl algebra.

  • @result The reduced Groebner Basis of the given ideal.

Example

A1::=QQ[x,d];	--Define appropriate ring
Use A1;
L:=[x,d,1];
Weyl.WRedGB(L);
[1]
-------------------------------

See also

Weyl.WNormalForm

Weyl.WGB

Weyl.WRGB

Introduction to Groebner Basis in CoCoA

Introduction to CoCoAServer