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The Dirichlet-Bohr radius

Denote by Ω(n) the number of prime divisors of n ∈ ℕ (counted with multiplicities). For x∈ ℕ define the Dirichlet-Bohr radius L(x) to be the best r > 0 such that for every finite Dirichlet polynomial n x a n n - s we have n x | a n | r Ω ( n ) s u p t | n x a n n - i t | . We prove that the asymptotically correct order of L(x) is ( l o g x ) 1 / 4 x - 1 / 8 . Following Bohr’s vision our proof links the estimation of L(x) with classical Bohr radii for holomorphic functions in several variables. Moreover, we suggest a general setting which allows translating various results on Bohr...

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