ApCoCoA-1:DA.LD: Difference between revisions
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DA.LD computes the leading derivative of polynomial F wrt. the current differential term ordering, or the hereby induced ranking | DA.LD computes the leading derivative of polynomial F wrt. the current differential term ordering, or the hereby induced ranking respectively. | ||
<itemize> | <itemize> | ||
<item>@param <em>F</em> A differential polynomial.</item> | <item>@param <em>F</em> A differential polynomial.</item> | ||
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<example> | <example> | ||
Use Q[x[1..2,0..20]]; | Use Q[x[1..2,0..20]]; | ||
Use Q[x[1..2,0..20]], Ord(DA.DiffTO( | Use Q[x[1..2,0..20]], Ord(DA.DiffTO(<quotes>DegOrd</quotes>)); | ||
F:=x[1,2]^2*x[1,1]-x[2,4]^3; | F:=x[1,2]^2*x[1,1]-x[2,4]^3; | ||
DA.LD(F); | DA.LD(F); | ||
Revision as of 13:17, 27 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 respectively.
@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(<quotes>DegOrd</quotes>)); F:=x[1,2]^2*x[1,1]-x[2,4]^3; DA.LD(F); ------------------------------- x[2,4] -------------------------------
