“…A classical result of Hecke [6] Before the present work, the universality of ϕ(s, F ) was obtained by Kačėnas-Laurinčikas [7], and also as a special case of the theorem given in [15], but both papers require rather strong assumptions. For instance, the universality theorem of Kačėnas-Laurinčikas [7] is proved under the assumption of the existence of η > 0 such that .…”