| #### 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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