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D.5.9.6 prepEmbDiv
Procedure from library reszeta.lib (see reszeta_lib).
- Usage:
- prepEmbDiv(L[,a]);
L = list of rings
a = integer
- Assume:
- L is output of resolution of singularities
- Compute:
- if a is not present: exceptional divisors including components
of the strict transform
otherwise: only exceptional divisors
- Return:
- list of Q-irreducible exceptional divisors (embedded case)
Example:
| | LIB "reszeta.lib";
ring R=0,(x,y,z),dp;
ideal I=x2+y2+z11;
list L=resolve(I);
prepEmbDiv(L);
==> [1]:
==> [1]:
==> 2,1
==> [2]:
==> 3,1
==> [3]:
==> 4,1
==> [2]:
==> [1]:
==> 4,2
==> [2]:
==> 5,2
==> [3]:
==> 6,2
==> [3]:
==> [1]:
==> 6,3
==> [2]:
==> 7,3
==> [3]:
==> 8,3
==> [4]:
==> [1]:
==> 8,4
==> [2]:
==> 9,4
==> [3]:
==> 10,4
==> [5]:
==> [1]:
==> 10,5
==> [2]:
==> 11,5
==> [3]:
==> 12,5
==> [4]:
==> 13,5
==> [5]:
==> 15,5
==> [6]:
==> 17,5
==> [6]:
==> [1]:
==> 12,6
==> [2]:
==> 13,6
==> [3]:
==> 14,6
==> [4]:
==> 16,6
==> [7]:
==> [1]:
==> 14,7
==> [2]:
==> 15,7
==> [3]:
==> 16,7
==> [4]:
==> 17,7
==> [8]:
==> [1]:
==> 3,2
==> [2]:
==> 4,3
==> [3]:
==> 6,4
==> [4]:
==> 8,5
==> [5]:
==> 10,6
==> [6]:
==> 14,8
==> [7]:
==> 15,8
==> [8]:
==> 16,8
==> [9]:
==> 17,8
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