Difference between revisions of "ApCoCoA-1:DA.LD"

From ApCoCoAWiki
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<command>
 
<command>
 
     <title>DA.LD</title>
 
     <title>DA.LD</title>
     <short_description>the leading derivative of a differential polynomial</short_description>
+
     <short_description>Computes the leading derivative of a differential polynomial.</short_description>
 
<syntax>
 
<syntax>
 
DA.LD(F:POLY):POLY
 
DA.LD(F:POLY):POLY

Revision as of 13:35, 22 April 2009

DA.LD

Computes the leading derivative of a differential polynomial.

Syntax

DA.LD(F:POLY):POLY

Description

DA.LD computes the leading derivative of polynomial F wrt. the current differential term ordering, or the hereby induced ranking respectivly.

  • @param F A differential polynomial.

  • @return The leading derivative of F.

Example

Use Q[x[1..2,0..20]];
Use Q[x[1..2,0..20]], Ord(DA.DiffTO("DegOrd"));
F:=x[1,2]^2*x[1,1]-x[2,4]^3;
DA.LD(F);
-------------------------------
x[2,4]
-------------------------------

DA.DiffTO