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D.6.20.19 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
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