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D.4.20.1 separator

Procedure from library mprimdec.lib (see mprimdec_lib).

Usage:
separator(l); list l of prime ideals

Return:
list sepList;
a list of separators of the prime ideals in l,
i.e. polynomials p_ij, s.th. p_ij is in l[j],
for all l[j] not contained in l[i]
but p_ij is not in l[i]

Example:
 
LIB "mprimdec.lib";
ring r=0,(x,y,z),dp;
ideal i=(x2y,xz2,y2z,z3);
list l=minAssGTZ(i);
list sepL=separator(l);
sepL;
==> [1]:
==>    x
==> [2]:
==>    y