... (n,n2).Proof. The proof is by induction. The result for Q0is obvious, and the result for Q1∼=P1is Property (D).Except for the base cases in the previous paragraph, the argument for the odd and ... sum of the outer terms. The right termprovides a generator of degree (2n, n), and the left term provides the rest of the generators. The above proof also shows the following:Proposition 4.2. The ... [A2] and Yuzvinsky [Y] for special values of r, s, and n. In [SS]a weaker version of the condition was proved for arbitrary fields and arbitraryvalues of r, s, and n.Stiefel’s proof of the condition...