Difference between revisions of "ApCoCoA-1:NC.LWIdeal"
From ApCoCoAWiki
m (insert version info) |
m (replaced <quotes> tag by real quotes) |
||
| Line 10: | Line 10: | ||
<example> | <example> | ||
Use QQ[x,y,z,t]; | Use QQ[x,y,z,t]; | ||
| − | NC.SetOrdering( | + | NC.SetOrdering("LLEX"); |
F1 := [[x^2], [-y,x]]; | F1 := [[x^2], [-y,x]]; | ||
F2 := [[x,y], [-t,y]]; | F2 := [[x,y], [-t,y]]; | ||
Latest revision as of 13:35, 29 October 2020
| This article is about a function from ApCoCoA-1. |
NC.LWIdeal
Leading word ideal of a finitely generated two-sided ideal in a non-commutative polynomial ring.
Syntax
Description
Proposition: Let I be a finitely generated two-sided ideal in a non-commutative polynomial ring K<x[1],...,x[n]>, and let Ordering be a word ordering on <x[1],...,x[n]>. If G is a Groebner basis of I with respect to Ordering. Then the leading word set LW{G}:={LW(g): g in G} is a generating system of the leading word ideal LW(I) with respect to Ordering.
Example
Use QQ[x,y,z,t];
NC.SetOrdering("LLEX");
F1 := [[x^2], [-y,x]];
F2 := [[x,y], [-t,y]];
F3 := [[x,t], [-t,x]];
F4 := [[y,t], [-t,y]];
G := [F1,F2,F3,F4];
GB:=NC.GB(G);
[NC.LW(E) | E In GB]; -- the leading word ideal of <G> w.r.t. the length-lexicographic word ordering
[[y, t], [x, t], [x, y], [x^2], [t, y^2], [y^2, x]]
-------------------------------
See also
