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D.8.9.3 firstoct

Procedure from library signcond.lib (see signcond_lib).

Usage:
firstoct(I); I ideal

Return:
number: the number of points of V(I) lying in the first octant

Assume:
I is given by a Groebner basis.

Example:
 
LIB "signcond.lib";
ring r = 0,(x,y),dp;
ideal i = (x-2)*(x+3)*x,y*(y-1);
firstoct(i);
==> 1
See also: signcnd.