Difference between revisions of "ApCoCoA-1:DA.Initial"
From ApCoCoAWiki
(Corrected example.) |
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</syntax> | </syntax> | ||
<description> | <description> | ||
| − | Initial returns the initial of polynomial F wrt. the current differential term ordering, or the hereby induced ranking, respectively. | + | <ref>DA.Initial</ref> returns the initial 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 initial of F.</item> | + | <item>@return The initial of <tt>F</tt>.</item> |
</itemize> | </itemize> | ||
<example> | <example> | ||
Revision as of 12:51, 7 July 2009
DA.Initial
Computes the initial of a differential polynomial.
Syntax
DA.Initial(F:POLY):POLY
Description
DA.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 QQ[x[1..2,0..20]]; Use QQ[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 -------------------------------
