Top
Back: T_12
Forward: spcurve_lib
FastBack: qhmoduli_lib
FastForward: spcurve_lib
Up: sing_lib
Top: Singular 2-0-4 Manual
Contents: Table of Contents
Index: Index
About: About this document

D.5.8.18 tangentcone

Procedure from library sing.lib (see sing_lib).

Usage:
tangentcone(id [,n]); id = ideal, n = int

Return:
the tangent cone of id

Note:
the procedure works for any monomial ordering.
If n=0 use std w.r.t. local ordering ds, if n=1 use locstd

Example:
 
LIB "sing.lib";
ring R = 0,(x,y,z),ds;
ideal i  = 7xyz+z5,x2+y3+z7,5z5+y5;
tangentcone(i);
==> _[1]=x2
==> _[2]=7xyz
==> _[3]=y5+5z5
==> _[4]=7y4z
==> _[5]=35z6

Top Back: T_12 Forward: spcurve_lib FastBack: qhmoduli_lib FastForward: spcurve_lib Up: sing_lib Top: Singular 2-0-4 Manual Contents: Table of Contents Index: Index About: About this document
            User manual for Singular version 2-0-4, May 2003, generated by texi2html.