Singular Manual: psigncnd

| #### D.8.9.2 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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