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

From ApCoCoAWiki
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</syntax>
 
</syntax>
 
<description>
 
<description>
DA.LD computes the leading derivative of polynomial F wrt. the current differential term ordering, or the hereby induced ranking respectively.
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<ref>DA.LD</ref> computes the leading derivative of polynomial <tt>F</tt> 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>
<item>@return The leading derivative of F.</item>
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<item>@return The leading derivative of <tt>F</tt>.</item>
 
</itemize>
 
</itemize>
 
<example>
 
<example>

Revision as of 12:53, 7 July 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 QQ[x[1..2,0..20]];
Use QQ[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]
-------------------------------

DA.DiffTO