Home Online Manual
Top
Back: PrimdecA
Forward: modDec
FastBack: monomialideal_lib
FastForward: mregular_lib
Up: mprimdec_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

D.4.14.3 PrimdecB

Procedure from library mprimdec.lib (see mprimdec_lib).

Usage:
PrimdecB (N, p); pseudo-primary module N, isolated prime ideal p

Return:
list l
a (not necessarily minimal) primary decomposition of N

Example:
 
LIB "mprimdec.lib";
ring r=0,(x,y,z),dp;
module N=y*gen(1),y2*gen(2),yz*gen(2),yx*gen(2);
ideal p=y;
list l=PrimdecB(N,p);
l;
==> [1]:
==>    [1]:
==>       _[1]=y*gen(1)
==>       _[2]=y*gen(2)
==>    [2]:
==>       _[1]=y
==> [2]:
==>    [1]:
==>       _[1]=y*gen(1)
==>       _[2]=y*gen(2)
==>       _[3]=x*gen(1)
==>       _[4]=x*gen(2)
==>    [2]:
==>       _[1]=y
==>       _[2]=x
==> [3]:
==>    [1]:
==>       _[1]=z*gen(1)
==>       _[2]=z*gen(2)
==>       _[3]=y*gen(1)
==>       _[4]=x*gen(1)
==>       _[5]=x*gen(2)
==>       _[6]=y2*gen(2)
==>    [2]:
==>       _[1]=z
==>       _[2]=y
==>       _[3]=x