f = Function(x^(2.0) - 4.0, -3.0, 3.0)
A = Intersect(f, a, 1.0)
B = Intersect(f, a, 2.0)
C = Intersect(f, b, 1.0)
D = Intersect(f, b, 2.0)
E = Point(f)
F = Point(f)
G = Intersect(f, c, 1.0)
H = Intersect(f, c, 2.0)