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