Difference between revisions of "ApCoCoA1:DA.Initial"
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Revision as of 14:07, 22 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("Lex")); 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 