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D.15.9.2 clocus

Procedure from library resjung.lib (see resjung_lib).

Usage:
clocus(ideal J);
J = ideal

Assume:
J = two dimensional ideal in noether position with respect to the last two variables

Return:
A ring containing the ideal Clocus respresenting the critical locus of the projection V(J)-->C^2 onto the coordinate plane of the last two coordinates

Example:
 
LIB "resjung.lib";
ring R=0,(x,y,z),dp;
ideal I=x2-y3z3;
list li=clocus(I);
def S=li[1];
setring S;
Clocus;
==> Clocus[1]=yz


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