“…There has been much work in the recent literature concerning systems of diagonal equations and their relation to AC (see [6,7,11,12,13,14,15]). In particular, it is known that AC holds for pairs of diagonal forms of equal degree k, except possibly when k takes the form p τ (p − 1) or 3 · 2 τ (p = 2), and that AC holds also for pairs of diagonal forms of distinct odd degrees.…”