Difference between revisions of "ApCoCoA-1:DA.Initial"
From ApCoCoAWiki
| Line 13: | Line 13: | ||
<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>Lex</quotes>)); |
F:=x[1,2]^3x[2,2]^2 + x[1,1]^3x[2,2]^2 + 1/4x[1,2]; | F:=x[1,2]^3x[2,2]^2 + x[1,1]^3x[2,2]^2 + 1/4x[1,2]; | ||
Revision as of 13:15, 27 April 2009
DA.Initial
Computes the initial of a differential polynomial.
Syntax
DA.Initial(F:POLY):POLY
Description
Initial returns the initial of polynomial F wrt. the current differential term ordering, or the hereby induced ranking, respectively.
@param F A differential polynomial.
@return The initial of F.
Example
Use Q[x[1..2,0..20]]; Use Q[x[1..2,0..20]], Ord(DA.DiffTO(<quotes>Lex</quotes>)); F:=x[1,2]^3x[2,2]^2 + x[1,1]^3x[2,2]^2 + 1/4x[1,2]; DA.LD(F); ------------------------------- x[2,2] ------------------------------- DA.LPot(F); ------------------------------- x[2,2]^2 ------------------------------- DA.Initial(F); ------------------------------- x[1,2]^3 + x[1,1]^3 -------------------------------
