In [5], it was proved that a collection consisting from Dirichlet L-functions and periodic Hurwitz zeta-functions is universal in the sense that the shifts of those functions approximate simultaneously a given collection of analytic functions. In the paper, we prove theorems on the universality of composite functions of the above collection.
Janulis, K., Jurgaitis, D., Laurinčikas, A., & Macaitienė, R. (2016). Universality Theorems for Some Composite Functions. Mathematical Modelling and Analysis, 21(1), 35-46. https://doi.org/10.3846/13926292.2016.1128990
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