D.5.15.3 Center

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

LIB "resolve.lib";
ring R=0,(x,y),dp;
ideal J=x2-y3;
Center(J);
==> _[1]=y
==> _[2]=x