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D.5.15.3 Center
Procedure from library resolve.lib (see resolve_lib).
- Usage:
- Center(J[,W][,E])
J,W = ideals
E = list
- Assume:
- J = ideal containing W ( W = 0 if not specified)
E = list of smooth hypersurfaces (e.g. exceptional divisors)
- Compute:
- the center of the blow-up of J for the resolution algorithm
of [Bravo,Encinas,Villamayor]
- Return:
- ideal, describing the center
Example:
| LIB "resolve.lib";
ring R=0,(x,y),dp;
ideal J=x2-y3;
Center(J);
==> _[1]=y
==> _[2]=x
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