Non-universality of the Riemann zeta function and its derivatives when σ≧1
Non-universality of the Riemann zeta function and its derivatives when σ≧1
复制标题
当σ≧1时黎曼zeta函数及其导数的非普遍性
DOI:
10.1016/j.jat.2019.01.006
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发表时间:
2019
影响因子:
0.9
通讯作者:
Takashi Nakamura
中科院分区:
文献类型:
--
作者:
Hirofumi Nagoshi;Takashi Nakamura
Let ζ (s) be the Riemann zeta function. In 1911, Bohr showed that the set {ζ (σ+ i τ): σ> 1, τ∈ R} is dense in ℂ. By Voronin’s denseness theorems in 1972, the sets {(ζ (σ+ i λ 1+ i τ),…, ζ (σ+ i λ n+ i τ)): σ≥ 1, τ∈ R} with distinct λ 1,…, λ n∈ R and {(ζ (σ+ i τ), ζ′(σ+ i τ),…, ζ (n− 1)(σ+ i τ)): σ≥ 1, τ∈ R} are dense in ℂ n. By Voronin’s universality theorem, for any fixed 1∕ 2< σ< 1 and any non-negative integer k, the set {ζ σ, τ (k): τ∈ R} is dense in C [a, b], where ζ σ, τ (k)(t)≔ ζ (k)(σ+ i t+ i τ), t∈[a, b]. In the present paper, we prove that the set {ζ σ, τ (k): σ≥ 1, τ∈ R}∩ C [a, b] is not dense in C [a, b].