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

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<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] -------------------------------