Abstract
In [VP], V.V. Volkov and F.V. Petrov consider the problem of existence of the so-called n-universal sets (related to simultaneous p-orderings of Bhargava) in the ring of Gaussian integers. A related problem concerning Newton sequences was considered by D. Adam and P.-J. Cahen in [AC]. We extend their results to arbitrary imaginary quadratic number fields and prove an existence theorem that provides a strong counterexample to a conjecture of Volkov–Petrov on minimal cardinality of n-universal sets. Along the way, we discover a link with Euler–Kronecker constants and prove a lower bound on Euler–Kronecker constants which is of the same order of magnitude as the one obtained by Ihara.
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