Home Online Manual
Top
Back: ivSickleDim
Forward: lpSickle
FastBack:
FastForward:
Up: fpadim_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document
7.7.7.0. lpOrdMisLex
Procedure from library fpadim.lib (see fpadim_lib).

Usage:
lpOrdMisLex(M); M an ideal of mistletoes

Return:
ideal, containing the mistletoes, ordered lexicographically

Purpose:
A given set of mistletoes is ordered lexicographically

Assume:
- basering is a Letterplace ring.

Note:
This is preprocessing, it is not needed if the mistletoes are returned
from the sickle algorithm.

Example:
 
LIB "fpadim.lib";
ring r = 0,(x,y),dp;
def R = makeLetterplaceRing(5); // constructs a Letterplace ring
setring R; // sets basering to Letterplace ring
ideal M = x(1)*y(2)*x(3), y(1)*y(2)*x(3), x(1)*x(2), y(1)*x(2)*x(3)*x(4);
// some monomials
lpOrdMisLex(M); // orders the monomials lexicographically
==> _[1]=x(1)*x(2)
==> _[2]=x(1)*y(2)*x(3)
==> _[3]=y(1)*x(2)*x(3)*x(4)
==> _[4]=y(1)*y(2)*x(3)