A2 (z)  z2—Ai 4z/ , where = 1 A2(z) —az2.1—a2' and this is the red'iced generating function which tells us, by its denominator factors, that the complete system of the quadratic is composed of the form itself of degree order I, 2 shown by az2, and of the Hessian of degree order 2, o shown by a2 . Again, for the cubic, we can find Aa(z) 1 —aez6 1—az2 .1—a2z2.1—a2z2 .1—a*, where the ground forms are indicated by the denominator factors, viz.: these are the cubic itself of degree order I, 3; the Hessian of degree order 2, 2; the cubi-covariant G of degree order 3, 3, and the quartic invariant of degree order 4, o . Further, the numerator factor establishes that these are not all algebraically independent, but are connected by a syzygy of degree order 6, 6 .