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D.8.7.2 psigncnd

Procedure from library signcond.lib (see signcond_lib).

Usage:
psigncnd(P,l); ideal P, list l

Return:
list: a formatted version of l

Example:
 
LIB "signcond.lib";
ring r = 0,(x,y),dp;
ideal i = (x-2)*(x+3)*x,(y-1)*(y+2)*(y+4);
ideal P = x,y;
list l = signcnd(P,i);
psigncnd(P,l);
==> 1 elements of V(I) satisfy {P[1] = 0,P[2] > 0}
==> 1 elements of V(I) satisfy {P[1] > 0,P[2] > 0}
==> 1 elements of V(I) satisfy {P[1] < 0,P[2] > 0}
==> 2 elements of V(I) satisfy {P[1] = 0,P[2] < 0}
==> 2 elements of V(I) satisfy {P[1] > 0,P[2] < 0}
==> 2 elements of V(I) satisfy {P[1] < 0,P[2] < 0}
==> 
See also: signcnd.


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