H. Nagoshi

On universality and simple a-points of a family of Dirichlet L-functions and their derivatives

In 1975, Voronin established the celebrated universality theorem for the Riemann zeta-function, and later, Bagchi and Gonek independently obtained its analogue for a certain family of Dirichlet L-functions in the q-aspect. In this paper, we generalize their results by establishing a simultaneous universality theorem fo...