Let a and q be two units of Zp, q not a root of unity, and let Vq be the closure of the set {aqn | n = 0, 1, 2, ..}. K is a non-archimedean valued field, K contains Qp, and K is complete for the valuation |.|, which extends the p-adic valuation. C(Vq → K) is the Banach space of continuous functions from Vq to K, equipped with the supremum norm. Let E and Dq be the operators on C(Vq → K) defined...