Abstract
We considerk Dirichlet series ∑a j (n)n −s(1≤j≤k),k≥2. We suppose that for eachj the series ∑a j (n)n −s converges fors=s j =σj+it j , and that Max σj<1/(k−1). We prove that the (Dirichlet) product of these series converges uniformly on every bounded segment of the line ℜes = (σ1+...+σ k )/k+1−1/k and we estimate the rate of convergence. The number 1−1/k cannot be replaced by a smaller one.
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Delange, H., Tenenbaum, G. Un théorème sur les séries de Dirichlet. Monatshefte für Mathematik 113, 99–105 (1992). https://doi.org/10.1007/BF01303061
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DOI: https://doi.org/10.1007/BF01303061